I think that pressure is more on plot than appearance, because it's not like Shounen pressured Kishimoto into drawing huge tits. But uh, on second thought, they maybe did for Oda and Kubo.
I don't know, I didn't find Attack on Titan's story any more impressive than most other Shounen. Like, I would say it's as well-written as maybe Fullmetal Alchemist, but I don't find it that impressive personally. Maybe it's because I fell behind, I dunno.