are humans more jack of all trades (able to survive in a wide range of temps, omnivorous etc…) rather than specialists?
Core survival (physiology) we are jack of all trades, more or less, but skills are aquired, not inherited. Anyone CAN do anything, it just depends whether they learned it or ever needed to. Einstein was poor at maths and quite a few other things, yet he contributed a lot to society and knowledge. My mother hasn't re-written the laws of physics, but she's contributed a lot to society and she's very good at a lot of stuff that Einstein may have been untrained in. It's all relative (no pun intended) – in an ideal world everyone would be great at everything, but I'm happy in a world where I'm good at fixing cars and OK at cooking and my other half is OK at fixing cars but good at cooking.
I think the point you're trying to make, and I'd agree with, is that it really isnt that hard to look after yourself and work appliances regardless of prior training so everyone should be able to manage it.
This is all far too serious 😀