Henderson for once raised a good point. 4.3 changes are very suited for a server population of "I can't login bc the server is full" but are quite harmful to the actual number of players around. I'm not saying this is the initial idea behind it, but from the resplies given so far, it starts to look like it.
Apart from that, nobody is going to know all of the other guys characters, so the line "Not attack the player/players they died to on any of their server characters for two hours." was and still is tricky as hell.