Folks,
The press and hold ---- holds good for virtually all modern aircraft ----- the reason is digital systems versus analog. A quick "flick" of a contact may not be enough for a digital system to recognize the signal being sent.
In the early days of the B757/767 is was a real problem to get crews to "press and hold" rather than a momentary press --- not easy to teach old dogs new tricks.
Tootle pip!!