I'll add to this. There are situations and people who need modern arch support for functional feet, but if you have healthy feet, arch support all the time only takes away from the muscle strength needed to keep them that way. I've found similarly for back support, my back is doing better sitting on a yoga pillow or stool (And putting effort into proper posture) than any amount of ergonomic back support.

Ergonomic keyboards, on the other hand, are something everyone should be using from the start (though we are still figuring out how to make them right). Humans evolved to sit and walk, but not to keyboard...