True. Although we (virtually) never do it, I suppose some people might argue that it is the only 'proper'/'foolproof' way of designing a sockets circuit - since there is always an element of gambling/guesswork in designing a 32A (let alone smaller) sockets circuit which supplies more than one double socket (or two singles).Well if CJR's theory is to be believed, there would have to be a name for it as we would all be doing it. Not that we can really in real life.
In practice, a sensible designer know 'what we can nearly always get away with' in any particular environment, but there can never be any guarantees about what will be plugged into the sockets. There should be no actual 'danger', in that, with proper design, the OPD should always protect the cable adequately but the designer should really seek to avoid (as far as possible) a situation in which the total load 'is likely to' exceed the In of the OPD.
Kind Regards, John