As above, won’t make a jots difference to Motability, but it might make discounts on accessories and options we take on our Motability cars more rare as the manufacturer may not wish to discount these to make the sale as the dealers were capable of doing.
I think you would still get accessories from the dealer but options probably will be different. Some manufacturers are fitting a lot of kit as standard but you have to pay a monthly subscription to get it switched on and I can see a lot more manufacturers following that trend.