I did not read the whole thread, so please forgive me if what I write here has been said before.
One important thing to understand when talking min-maxing is that if you are playing pen and paper d&d the importance of your stats depends hugely on the DM. A good DM (imo) will emphasize on roleplay, making it less important who deals out most damage in combat. I personally preferred playing a druid in our AD&D campaigns knowing very well that the druid was a weak class in relation to the kind of campaigns we did. Nevertheless I never felt bored because I was among friends and I was having a great time roleplaying my character.
In a computer games things are different. You might say that the DM has been substituted with the computer program, and so whether roleplaying can be fun depends hugely on the developers. I get from what has been said that roleplay will be possible in BG3 full release, and that it is not just about combat and reaction rolls, but we'll see. But for whether or not you should be min-max'ing: If you like me enjoy playing on a difficulty level where you have a fair chance of completing the game without optimizing every fight and encounter, and where you can select party members from a peronality/roleplay perspective and still stand a chance against your enemies, I'd say choose roleplay and story over min-max of stats and skills.
If however you like to test yourself on harder difficulty I think it is reasonable to go for min-max, since well it IS a computer game, and how you want to play it is up to you (assuming you play single player). So well I'd say it depends on what you want to get out of the game really.
