In reply to tony:
Like Tony, I have wide feet and find most shoes more stable and comfortable for off road work without the insole, especially as I can often then wear thicker socks.
Sometimes, especially on some board lasted shoes, the midsole takes a battering, as it is normally offered some protection by the insole.
In the designers mind, the insole is part of the foot shaped product, and offers extra cushioning and personalised shaping. I just find it usually better without.