The requirement in BS 1363-2 is that the socket must carry the required elevated levels of current for a prolonged period without showing any deterioration, and that it must do this for many more cycles of current than a "normal" socket, and must thus be marked /EV on the rear.
A "normal" BS 1363-2 socket outlet of any form without /EV would not be acceptable for use for EV charging, and would thus be used outside of it's design criteria. Thus outside the scope of it's product approval.
Oh, by the way it has not, been taken out, it has been aligned with BS 1363 as follows:
722.55 Other equipment
722.55.101 Socket-outlets and connectors
722.55.101.0.201.1 Each AC charging point shall incorporate:
- (i) one socket-outlet complying with BS 1363-2 marked ‘EV’ on its rear and, except where there is no possibility of confusion, a label shall be provided on the front face or adjacent to the socket-outlet or its enclosure stating: ‘suitable for electric vehicle charging’, or...
Not many would have a copy of BS 1363-2, which is why I posted the quote from it for you!
The work I mostly do now means I have to have access to hundreds of standards and 1363-2 is one of those I need to have access to.