Note that there are a variety of adjustable-height footstools for resting your feet at a natural position while your seat is elevated. I mention this because it

Note that there are a variety of adjustable-height footstools for resting your feet at a natural position while your seat is elevated. I mention this because it increases the range of ergonomic possibilities. Mobility issues may still prevent someone from hoisting themselves up onto a high seat, so your point still stands.