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I think making BG3 turn-based will help a lot in jumping over that hurdle, but a lot will depend on feedback and UI design. Something I do like very much is that Larian embraces the dice-roll, rather then hide it. It's is implimented in skill checks and it pops up when making a critical hit. I think this kind of visualization should help a lot in bringing out what +1 actually means.
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Better, more intuitive design usually helps a game, but I'm not sure I agree it will make much difference to bringing in a wider audience.
The videogaming audience may have expanded massively over the last 2 decades, but the "nerdy games" audience is still pretty small. Most videogames companies seem to have preferred to take their games towards the mainstream tastes.
