I doubt it's worse now than it was before for manga authors. I think it is shitty but sustainable, which is why it's still going. It's not like there's no way to draw something closer to your own pace either given series like Berserk and Hellsing; it just means more money if you rush em.
Skimming through new One Piece chapters, it does look like decades of this are catching up to Oda & his assistants. Maybe it's nostalgia speaking on some level but I doubt it's entirely that; I really don't recall it being this sketchy and simplified before. Hell I have old volumes lying around now and it didn't.>>16553
I think there's a lot of respect for the administrative side of things in Jump. Partly for valid reasons (their editors do historically offer good advice and have good taste & standards) and partly cuz they don't wanna rock the boat over the legit bad parts.