The mental changes don't appear to have any bearing on her in Roya. You would think altering someone's very being would be reflected everywhere but it's not. Her outfit doesn't change in Roya like her irl outfit does. Her priorities and attitude don't change in Roya like they do irl. The mental changes only seem to matter in irl and Roya seems to be severly neglected. You beat one big bad and then the others are fodderized in a group or never show up then it's straight to the final boss.
You can say the progression is fine, that's your opinion as it is mine that it is not because she jumps the gun like crazy. I'm not going to argue this with you or anyone. Everyone is entitled to their opinion and I am keeping mine. imo the erotic content is tacked on and the main campaign is phoned in and I want to know if that is going to change for the better.
There are a lot of elements in this game that I feel are being underutilized to the point that I don't understand why they are even in the game.
Being entitled to an opinion is fine and all, but several points you mention are just factually incorrect. Plenty of mental changes impact Aura's behavior in Roya. Bonds, a ton of perversions, language modifications, and other things I don't feel like typing out. Even her wanting to wear cute clothes has a debuff in Roya. There are also examples of changes in Roya influencing her in real world scenes. The debuff when she starts wearing heels also has a very minor impact on her appearance. If you are bulldozing all the boss fights then you are either playing on a super easy difficulty or cheating. I don't have an issue with that, but you can always try not doing so if you want that aspect of the game to be more engaging.
Aura doesn't "jump the gun like crazy" in any way shape or form. The game has a lewdness progression system that forces her to perform increasingly depraved acts. I mentioned this before, but there are hard limits on how early into her corruption she will perform certain acts. Her lewdness stat needs to be in at least the mid 30s before Aura will have sex, and multiple less extreme scenes need to have been triggered before any of those will happen. There's a clear logical flow to pretty much all of the lewd content. Early scenes are usually minor rewards with a minor cost, or easier ways of doing things that have a slightly higher corruption cost or start a chain. Once you reach the midgame the lewd scenes start having lasting consequences, and late game you have to struggle to not be overwhelmed by the compounding consequences of those choices. The main campaign is what it is. If you aren't finding it challenging then it's not going to suddenly magically become something you like in the final dungeon.
1. The collar. It takes away her OP powers and she can only take it off once a day. You would think this would lead to some spicy situations but it doesn't, it literally never does. As a story device it gives her a reason to start from scratch and join a guild which is good for balancing and progression but if she can handle all challenges the game throws at her with the collar then the collar is completely pointless. Is this going to change?
It leads to her spicy outfit. Her abilities being limited can directly lead to a couple of spicy situations, and I'd argue is the cause of all her scenes. Just not directly in battle. Which I'm glad for, because I can't stand most "battle fuck" style games. If you find all the combat too easy you should play on a higher difficulty, you won't anymore.
2. The erotic stances. These come too late to be of any use and are of dubious use to begin with given how easy combat is and the fact that enemies do not respawn. You would think the stances would lead to battle sex, game over rape, or even cut-ins of her flashing because that's what the skills say they do... at the very end of the game an entire section of her mindscape is dedicated to them. Are these ever going to amount to more than flavor text?
You don't need to reach that chamber to unlock any of the seductive stance related skills. This will be the final time I acknowledge the whole "easy combat" complaint, because that's a choice you are making. I don't really care about battle cut-ins, but it's something you could suggest to the developer. They seem like they would be a very low priority addition though. The lewd combat skills have their uses, but adding a battle sex system would be taking the game in a totally different direction from its current design.
3. Her guildmates.
Is anything meaningful going to come from the guild? Any questing spicy or otherwise? Are they just here? Is their character ever going to be expanded on?
John can fondle Aura, and there's a blowjob scene with him you can miss as well. The only way to trigger sex with John is to have zero willpower after unlocking a mental change that tells you that it will lead to Aura doing sexual acts with others. It's literally Aura fucking John out of primal lust, so I don't know what other buildup is needed. Also, he's partially there to make sure Aura always has a source to take out her sexual desires once you have made that mental change.
John's dream is to build a harem and he seems like he'll be quite important in the good ending, so that might be expanded on in some of the good endings. If not there's a chance for something to happen after the main stories are finished.
I'm not trying to complain. I'm just seeing a lot of what looks to be dead ends. And the game is coming to an end so..... but if you say it's going to be worked on after it's done then I suppose all I can really do is wait and see.
Except for additional art assets the lewd scenes are all supposed to be complete for the 1.0 release, so don't get your hopes up for anything before then. The good news is that 1.0 is on schedule for a release early next year. After that, the developer has said the plan is for extra content to be added in a modular way similar to how Larian Studios added side content to the Divinity games.