I find that with PBs, folks tend to have preconceived ideas as to the characters based on that PB, you see the same PBs across multiple games, people getting very precious about said PB (but it'll wreck immersion if we have 2!). TBH, you probably don't have the rights to use that image and likeness either, but that's something entirely different. Imagine though complete strangers taking your image and likeness, plastering it across the internet in weird text fantasies. You probably wouldn't like it, and it probably isn't treating them like you'd want to be treated.
This is a fantasy fun time, I get it. But ultimately it's a text game, and personally I wouldn't mind a game without PBs so I focus more on the text of the game. Or, I should use historically accurate public domain images.
I'm guilty of all the above. I'm going to change. No more.