considering you'll respawn very soon after you died.
I was thinking about this, too. But since 0.8.8 there is a timer that tells you when you can click and respawn.... if you click before that time (2 or 3 seconds, maybe? I'm not sure), nothing happens... if you click after that time, you respawn. If you don't click at all, the game will force you to respawn, but after several seconds only (I don't know... 10, maybe? Or more?). Then, if the player does not click, there would be all the time required to see the whole replay. If he clicks, instead, he would just stop replay and spawn immediately. However, this is just an idea. Instant death replay may make it more clear that each character has got only a few death animations... but however may be nice to see from which direction did the rocket or rail that killed you come. And slow-motion gore may be nice!
Note: Respawning click worked at the same way also before 0.8.
simply before there was no text telling you when you are allowed to click.
PS: About deathcams in Fromhell's video, I also like the last one...