In addition to the Spell&Shield video, I also like this short where Brennan Lee offers some comical but interesting perspective on the matter :
https://www.youtube.com/shorts/xrA9n7ywinAedit : also, the comments are hilarious. I recommend.
Funny buy flawed, since wizards would probably study and practice magic, not persuasion tactics. Just as a fighter probably would practice sparring and combat maneuvers, not reading up on how to sell ice to eskimos.
Well, it´s not black and white i think. For the wizard doing things such investigating a crime, studying ancient artifacts/books or unveil some plot from a cult(that can be the case of BG3) may add up to its ability to experiment or create new types of magic or just get better at it from that experience as an investigator. And those things also require the ability to get as much information out of people/things/scenes as possible. As for the fighter, i guess you´re right about the sparring and combat manuevers but it´s not like they are barbarians who just seek to "smash" everything, they also need to study combat tactics to improve and learn to get info out of people, either they are common folk, criminals or something in between.
