I think theres a shit load of people out there, in work and out of it, who are not well suited to the modern work-place, yeah.
The modern work place however is often a pretty toxic environment, demanding more from people than they should give to their home/personal lives, whilst offering little to no support.
I am absolutely unsuited to the workplace, I have never held down a 'proper' ie, employed, somewhere outside of my home, regular salaried job.
When I was younger I wasn't attractive enough, I was too qualified but not experienced, or too qualified and liable to be bored, or just not the right fit... I got some interviews, I never once got the job, out of hundreds, thousands probably, of applications.
My mental health fell over, and then my disabilities were DX and became obvious to people other than me and started to affect my mobility, so now I am too qualified for some things, not nearly enough qualified for others, have no workplace experience AND no employer in their right mind would employee me (I certainly wouldn't!) because my health means I am unreliable in terms of output and actually showing up. I would also need a bunch of accomodations making for me that another employer would not need.
So now I am still unsuited to the workplace.
I still earn a living, I just work for myself and do a range of things that keeps my jumpy little ADHD brain happy and shuts up the brain-weasels so I don't go totally nuts!
But there are loads of reasons why people aren't suited and it isn't anything to do with 'lack of resilience' or 'inability to suck it up' or 'well I hate going to work I don't see why I have to and you don't'...
The modern world we live in is far too mentally demanding, we're NEVER off duty now, it is incredibly stressful - for many people who 40 years ago were just about able to manage, the current way of life and expectations from employers is just too much... and that is why the huge rise in mental health diagnosis, time off work for them, long term sickness issues.
We've also got rid of a ton of jobs that were better suited to folk like me, and other folk who struggle now - so much manufacturing, construction, engineering etc happens overseas. So many 'lifestyle jobs' where job and life were not seperated (bargees, HGV driving is going the same way, farm labour work, shepherding..) are dying out, streamlined, sent over seas... and there go the opportunities for folk better suited to such endeavours.
Unsuited to the workplace does not mean lazy, unskilled, useless, low standards etc, it can mean square peg and round hole!