The issue that many are overlooking is that yes, the grant will be applied to eligible cars BUT there’s nothing to stop a manufacturer re-configuring the discount that it already gives to Motability.
For example, manufacturer previously gave Motability £10k discount on a particular EV. That car now gets a £3.5k govt grant. The manufacturer reduces its discount to £6.5k which, added to the grant, means the same £10k discount and no change to AP. The grant has been applied, but the winner is the manufacturer.
This exact same thing happened with house builders during the help to buy scheme. The winners were the house builders whose profits rocketed, at the tax payers expense!