I feel like I've only read Liam and Louis? talking about how hard scheduling/obligations were as part of 1D? Harry has only gone on about it being great experience and Niall too? Am I misremembering things?
I think Harry is the only one that hasn’t said anything about how hard it was, but then again he hasn’t said much at all other than it was a great experience.
Niall has been mostly positive, but he’s brought up the hard schedule a time or two as well.
It could be just the difference in their attitudes in general and how much of a role they had to play. Niall’s “role” was, it seems, not too much different than who he is - except for the terminally single thing. The others had to put on more of a show about who they’re supposed to be, so it was probably a lot more exhausting emotionally on top of the physical grind.