Qmax: what are you on about
These profiles are designed around engine failure, they are calculated to provide for a recovery from an ENGINE FAILURE!
They are NOT designed for other malfunctions - no one can build in a design for every single malfunction - can they?
Going up and back is the best way of securing a safe landing in the event of an engine failure during takeoff, because (a) you've just flown that route, and (b) you know that the landing site will accept you! Thats why it has been designed as such. If you simply transition fwd, then you don't know what the landing site will be like when you touch down from an engine failure, do you? And you'll have less control over your fwd speed before you hit the deck.
Do you think someone simply 'took a fancy' to designing a peculiar launch profile for the fun of it???
If an engine is going to stop, may I suggest the best time for it to fail, is during the take off, when pressures and temperatures are high and low respectively.