(a trainees answer)
Confirming the a/c type is to check we have the right type on the strip in front of us, its a mandatory requirement in our operating manual. I can see where the 'out the window' thought comes from, but you can't see ALL the stands from the delivery position. So the verbal confirmation from the pilot helps. The strips aren't often wrong, but if they were and we didnt check etc etc...
As regards holding short - I personally have heard a lot of pilots readback that they will hold short of a holding point such as LOKKI, however we do have regular clearance limits that are on one taxiway short of another (Bravo short of Foxtrot) etc. We also state 'hold short' when transferring to tower for runway crossings.
I a) hope I am correct (others more experienced may confirm or deny this) and b) hope it has answered the question
