Russ McD
Yes, I totally agree with you ... as a keen off-roader, the use of access=no just because a delivery van can't drive down it, is wrong.
I'm pretty sure the Wiki reflects that, and I will continue to change any I find used in that manner.
Tags such as surface and smoothness should be used to restrict use by a car/van with the routing software programmed accordingly.
Cheers, Russ.