Capn Bloggs - "Hmm, clicking and verifying movement definitely confirms TOGA has been engaged; pushing up then clicking doesn't confirm TOGA unless you also refer to the engine instruments/thrust limit. If you remove your hand (for, say, controllability) the throttles might come back if TOGA did not engage..."
Controllability? There's no need to remove your hand from the throttles at that time. HOTAS is still a concept applicable to today's flying.