There is no way Larian is going to basically develop 2 sets of game rules to satisfy some ideal that they should. I mean that is just expecting too much.
No : Solasta, tiny in comparison to Larian, does it = it is easy for Larian + Swen said that "they would try to implement the rules as pure as they can". They can. They should. Plus we know they could easily give some options to deactivate some of the main core changes (health food, jump, height, scrolls class limit, healing touch throw potion, explosives...) + It is more intelligent economically : they want to attract many public and their ideal is to satisfy many public, including D&D fans for future releases. So, they have to do it.