I paused the video pretty much immediately when he says it's a complicated topic. It's a very uncomplicated topic for BG3...it's largely single player...do what you want. You technically could play with others but really playing a videogame with randoms is always terrible regardless, you are extremely, insanely unlikely to be matched with someone who knows D&D or what they are doing and you could be matched with trolls trying to ruin your experience. Beyond that I don't think very many people will play this game with their actual D&D friends more than a session if even that. It's a 150+ hour game...you won't be playing the whole thing with your buddies because you don't need to wait for when they're all available at the same time or restrict yourself to a session per week or something. So just do whatever you want in the game.

Power gaming and min maxing are real issues at actual D&D tables...always listen to the DM when at a D&D table and don't try to hog all the spotlight there. But in BG3...this adventure is literally all about you. Go knock yourself out, be as powerful as you wish.