I guess the point the OP is making is "why is there the mini-loading screen at all?" If they don't want to change how raise works (raised character teleported to the mage's position) - they could remove the blackout screen by just making raise act like a Rescue-Raise. Pull the character to you, then raise them. Done. No need for that screen.
Personally, having the screen blackout means you might miss the next mechanic's tells - and then you might wind up dead again anyway if rez invuln wears off before the telegraph does. Not being able to see what is going on during that time can put a player in a rez loop.