It doesn't sound like the sort of place to take a wheelchair unless maybe it's a child's one with off road wheels. You'd think there'd be a good reason for them doing this though wouldn't you? Seems like a terrible shame though.
I once spent a winter working with an upland footpath team and one of the golden rules with upland paths is: 'if it ain't broke, don't fix it'. If you do too much building then you loose the natural feel of the path. The main aim is to help reduce and repair erosion and provide a walkable surface in areas where there isn't already one.