This doesn't address anything I put. BG3 in a way is also a niche game, hell, all CRPGs are. It'd be actually less niche if it implemented the 5E rules because D&D has so many players. I can say gameplay in Solasta is great because I bought both games and played both. Solasta plays better, MUCH better. All the encounters are balanced around your party's spells and abilities, thus making it rewarding when you use those. BG3 is balanced around gimmicky mechanics such as shoving on every turn, surface effects, exploding barrels, getting high ground and eating food that completely negates the difficulty. You also don't have to use your abilities, many of which are not even implemented (such as only rogues getting extra bonus actions). I never said anything about Solasta's plot, just that the gameplay is immensely fun, probably the most fun I've had with TB games. Therefore I don't see anything extremist in implementing the system the game is supposed to be based on, less so considering the number of D&D players and possible cross-sales, i.e, people that play BG3 and want to buy the books.
I don't think that it will be a niche game and a lot of people will be against homebrew rules. Purism is an anchor that slows down the progress. If you don't like certain rule then complain about it specifically, don't whine about all rules in general. It's very clear that you haven't played BG3 for a long time because your statement about food and height advantage are already incorrect. I also was against food restoring health, they removed that mechanics. I have no problem with shoving, it's a fun mechanics, good addition. Surface effects is a great addition, they just need to make sure that they appear only where it makes sense. Exploding barrels are good if it makes sense for them to be placed there. I also don't like random explosives everywhere.