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...
> arch support all the time only takes away from the muscle strength needed to keep them that way
Years ago, I suddenly increased my walking and started having horrific pain in my arches. In response, I started wearing arch support insoles all the time. If I didn't wear them, my arches would ache. Like you said, my foot strength got very poor and I eventually suffered a serious injury in my midfoot playing basketball. During rehab, I stopped wearing the arch supports and eventually moved on to minimalist shoes and my feet have gotten dramatically stronger and I never notice weakness in my arches anymore.
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...