Well yes, the spawn interface makes it seem like reinforcements, but really it is a physical respawn because in real life, the reinfs wouldn't have the knowledge that you had gathered before you died.  In other words, say you got killed by some well concealed sniper, but you discovered his position just before he kills you.  In real life, the sniper would still be free to camp out and slaughter team mates, but in game, after respawning you would probably just sneak around behind his little pow-wow area, and knife him in the back since you new where he was (even though you died a minute ago).

Wow, sorry for the OT