I think you are over thinking it and being disingenuous to your 'friend'
it's horses for courses. She probably referring to doing a shift and leaving all pressure and annoyances at the door when you walk out, and not being the one responsible if something goes wrong.
I work for one of the big 4, picking peoples online shops, and it is exactly what I wanted and needed.
Previous jobs were physically and mentally challenging, plus so much responsibility, the constant deadlines which couldn't be missed because it had such an impact. some days just finding time to go for piss was almost impossible.
Now I have set hours which are the same days every week, I can add extra days or more hours on the days I work when I want, I have never had a bad reaction if I've been asked for overtime and I haven't wanted to do it. You get set amount of time for breaks and everyone takes them, when convenient for them, want your half an hour break after only working and hour? sure go for it.....
Yes I start work 4am, but have been offered a change to my contract to later starts if I want it, but I actually like my 4am start! less customers about and I can put my earphones in and listen yo music for a few hours of my shift.
There is a pick speed target which for the first 2 weeks I thought was impossible to hit and hated it, but now actually I pick way over the target. So much so I occasionally do stop for a short catch up with a other staff and still be well over target. unfortunately not everyone is as fast and has that luxury.
I deliberately will not take interest in how things are organised or run, as I know I'd get frustrated and start sticking my oar in and piss people off. 😆 There is plenty of scope for promotion and proper careers within the company. I would never look at becoming a line manager or anything else though, because that's were the pressure and stress starts, and it looks ugly.
Application process means they actually have no idea what your work history is, after 30+ years of working I could have easily applied for a management or admin role there. They had no clue so there was never a "oh she's over qualified to pick peoples shopping"
My managers are lovely, although really really stressed and one gets grumpy through stress but it's not personal and I usually just invite them to have moan and off load then give them a sympathetic smile, and go back to my picking.
The wage is low but above minimum wage, so if you can manage with a pay cut for less stress, then yes it can be as your friend thinks.
But it's not for everyone, there is a high turn over of new starters probably because of the pick speed and the being on your feet all day, the ones that stick around and manage to hit the target will then stay for quite a while some will train in other departments.