There are many mechanics that were established by BG and is standard for CRPGs that Larian chose to not implement.
Like what? I genuinely can't think of any, besides real time combat. Again i never finished BG2, it felt too clunky to play when i tried and i dropped it.
And yes, BG2 does many things better than BG3 at the moment even being 20 years old. And that is the alarming factor.
Again, like what? Give me an example.
If I might interject here; it would be tricky to quantify these as they would be be based mostly on subjective opinions. From what you have said BG2 did not appeal to you, so I have to assume you feel BG3 is superior, whereas for myself BG2 is possibly my favourite game of all time and my opinion on BG3 so far is surmised by your quote: "it felt too clunky to play when i tried and i dropped it". Of course that opinion could well change by the final release and I truly hope that will be the case but as things stand, I find it quite flawed.
Off the top of my head two things which I feel were done better in the previous games were party control and inventory, for example. There are other things too but they are far more subjective.
