I repeated my argument specifically because you said it made no sense to you, so I repeated it in a clearer way in an attempt to orchestrate my argument better, but you seem to not like it regardless so I'm just going to address the points in this new statement
I have no idea where you're coming up with the idea that the harem route where everyone gets treated fairly equally is nonexistent. On the contrary, it's the most common representation of harems in porn games and visual novels, and certainly not just a "nebulous ending" given there are entire games and VNs based on this premise without it solely being a route. It's much more common than harems where you pick only one girl to be your main lover and the rest are your concubines, that's a fairly niche subset of harems for most games. which is, as I said, the entire reason people get confused by the title in this game and what my argument was attempting to achieve in the first place, not defend some other guy's post like you think I'm doing.
Since you're bringing up the game's characterization as an example I suppose I should as well. I don't think Vex is written very realistically. In fact, I don't think any of the characters are written super realistically. Most of the characters are written like most porn game characters are, a trope and baggage that MC helps solve through their heart and their penis. There's nothing wrong with this, but I also don't think it'd immediately ruin her arc if you had multiple lovers. As you said, she is possessive, but that's nothing new when it comes to harem tropes and I've seen plenty of writers have similar characters get over that when it comes to harems.
You're also not wrong when you say I'm somewhat inexperienced when it comes to coding, but I'm also not quite sure where you're coming from when you say they'd have to rewrite over 50% of the codebase that sounds like hyperbole. While we are on the topic of mechanics I would like you to elaborate on why you think me not being fond of replayability when we only have a third of the game is unfair. Criticizing the game for what I do have in front of me is a perfectly valid complaint because I'm criticizing the content for being too tedious to get through as it is, much less if you add 66% more game on top of that, even if they do add more content for the lover routes to incentivize that replayability I simply don't find the gameplay(which is a criticism quite a lot of people have so I'd consider that one valid) interesting enough to dedicate multiple playthroughs too. Nor do I want to break the hearts of characters that I do like just so I can experience more content. It just feels like an oversight on the part of the devs.