I agree with you regarding the comics version of Strange but not about the MCU version. MCU Strange is clearly quippy because that's what the MCU execs and writers want him to be. Pretty much all of the MCU characters are quippy, whether it makes sense or not. It makes them all end up sounding identical, but that's okay. It's part of the MCU brand. Fans like the nonstop snarky humor in these films. They expect it, and it adds to their enjoyment of the movie experience, so why not? Sure, it ends up making MCU Stephen Strange sound exactly like every single other MCU character, but I think that is what a lot of fans want to see in these films. ¯\_(ツ)_/¯