I worked with a lot of projects that involves coding (Mobile, ML, Web, IoT) but never in adult games. The render handling part from what I can tell is done via graphical tools and depends a lot on the skills and experience on the person handling them. Answering all the other your questions: I am pretty sure after 6 years he should be able to choose what's more important to have an update ready. Im not saying he should half ass it.
The problem with this guy is that he claims his game to be an 'erotic', sensual novel. Basically, he finds all adjectives to justify the lack of sexual content (when comparing the time this game has been under development). Although, the game has routes since the early stages that contradicts those explanation, such are the routes with the sexual education, the janitor, the blackmail by the teenagers, routes that are specific to very hardcore porn. Therefore, the game contradicts his own words.
So, assuming he really intends to do an under the radar incest game with high quality, what exactly is high quality? The renders? The story? the sex scenes? the animations? Look, I already said this before, you don't see italians being portrayed as they are, he has no knowledge of how the mafia really works. He literally spent money buying gun 3D models, so a lot of italian guys can show heavy weapons to scare off little kids and small time thugs. If you have any kind of mafia movie knowledge, you know that's not how it works, so you can't say he's looking for realism in the story at least, so we have another contradiction here.
As you see above, perfection doesn't exist and is subjective. Whenever someone says they want to do something perfect is just an excuse to be slow and late, and it is exactly what is going on here. When you ask "But do you agree with me the premise of this project is always its meticulous details?" what details to refer to? If we nitpick more stuff around this game, we'll find a lot of flaws and mistakes. This game does have a very good visual, camera angle, filters and models. But, let's go back to the fabric touching scene, is that really perfection? You may be tempted to argue slow burn, but it isn't.
At this point of the thinking, we can imagine a X and Y graph with a curve where content is X and time is Y. At the middle point of the curve is where he needs to be, beyond that, more updates like this will happen, where time increases and content decreases, therefore turning into an increasing LINE.
As for your third point, I don't really feel you absorbed the entire point. The point being is that everyone releases 1.0a, 1.1b, 1.3c and so forth to fix small mistakes like that, therefore he has many ways to deal with them other spending a massive amount of time to fix them. Even then, you have that game Dreams of Desire that is also about incest, where it didn't even have animations, only two years after the game was completed the developer decided to remaster the game with animations. Take this game for example, you have part 1 where he was learning how to develop basically, now part 2 you have animations too. It looks positive to see that he's improving, but at the same time it shows quality inconsistency, because the simple fact he improved implies quality change, so how much details was there previously?
