Best thing devs can do to minimze save scuming is give mutiple great outcomes that people will like, simple as that... making great narrative.
I don’t think that’s necessary. I think of skill checks in a similar way as building character for combat - it’s an RPG, you create a character and you can’t excel in everything. Being able to easily bypass restriction that come from character builds, does invalidate a lot of appeal of a cRPG. If character can pass every skill check, than skill checks are themselves pointless.
It is perfectly fine to with hold certain specific interactions from characters not specialising in certain fields. Of course, it would be an issue if some substantial content was held hostage behind very specific quests but I can’t think of any such situation in BG3.
And than there is an issue of RNG heavy roll like d20 being rather chaotic in characterisation of our PC. Sure, I might have +7 bonus, but I rolled 2 so my smart wizard fails arcana check. But at the same time he rolled 20 on bashing the door open in spite of having 8 strength. I do think those situations could be turned good by life DM, but in cRPG they will just feel wrong. The game likely will have only one resolution for each situation, and each of those examples would need to be handled differently for different characters.
