Bo Nix was PFF's top-graded QB under pressure in 2023. This illustrates part of it - 2nd in completion-rate, a healthy scramble rate - but the other part is that his pressure-to-sack rate was absurdly low - lower than Richardson's last year.
So, you have a guy who makes very few negative plays (sacks, INT's, fumbles) and a guy who can vary trajectory, make plays out of structure, and has good arm talent. Idk lot to like.