PIP for Amputees

I want all amputees to be given PIP at enhanced rate.
When you lose a limb you become disabled that limb will never grow back yet amputees are often turned down or given standard rate meaning they’re not eligible for a Motability vehicle.
This is something that most people with a disability need, most amputees get a prosthetic but they often can’t wear them due to comfort, liner problems, socket problems the list goes on.
Some are told at their assessment that it’s not classed as a mobility aid, so why do the government say different ?
It can be very difficult for an amputee to walk far they need a vehicle & a blue badge regardless of whether they can wear their prosthetic or not!