You realize that asking for an option to choose to have 5e core rules (or not) is the exact opposite of "forcing what I want to play on you", right?
You
don't realize that an "OHPSHUN" still needs to be implemented, tested, balanced, and supported by the developer, and that increases the workload for the same amount of content.
You don't think Larian has already done that?
Its well known that Larian increased the HP and lowered the AC of enemies in order to keep players from missing so often. How would they know to do that if they didn't already test the 5e rules? In fact, I remember reading a quote saying that they did test with full 5e rules but found that players missed too often which was the exact reason why they decided to decrease AC and then balance it by increasing HP. So they've already done it. And the "development" would just be changing some numbers around, the equivalent of having multiple difficulty settings which every game already does. In fact, the original BG had a difficulty setting called Core which emulated the core 2e rules, so its already part of the franchise.
Not to mention that 5e has already been developed by WotC since 2014 and has already had thousands if not millions of playtest hours by people actually playing it. Larian would just have to input the numbers. Let players have the option to miss more often if they want to.
And even if it did take significant development time (which I doubt), it would be a worthwhile investment because it would please a lot of fans. People like me who don't care about Divinity and who don't care about a sequel to Baldur's Gate. A lot of people have been wanting a video game implementation of 5e since its inception and that was one of the main selling points of thus game.
