I know what you're saying about it being a mouthful, but I do feel that it's important to get this right. All of the informaion passed is important to the controller.
OK, you've been cleared on a certain SID, but by you telling him what SID you're flying, it reassures him you're flying the right one. There have been loads of guys who read back a clearance correctly and then flew a completely different SID.
Passing altitude/level - he needs to validate your Mode C readout and can't do that otherwise. If he subsequently has to ask to what your level is - surely that's cluttering the RT when it needn't have been?
Cleared altitude/FL - this was brought in a number of years ago in response to an increasing number of level busts when pilots had misinterpreted the stop alt/level on the SID plate. This reassures the controller that you are in fact aiming at the correct alt/lvl and he's not got to worry about that opposite direction traffic 1000 ft above your stop.
At the end of the day - yes we all know the reasons why we are supposed to do things a certain way, but some people still don't!!! Doing things the right way is just a easy as doing them the wrong way.
Cheers!!
