I don't see it as catastrophic. Personally I'd leave it on in its own channel like it is now. I just don't like that it clutters the other HOST messages I use on a regular basis.
I can somewhat understand your reaction. By your join date you might not have bee here when we used to have it. But new players coming from other games would probably find it weird if we didn't have kill msgs.
However, by your use of pejoratives like "spam" and "clutter" you are implying that the kill messages are less valid system host msg than others. Hitech might disagree. From a social engineering standpoint, they may be more import.
I think an argument could be made for color coding categories of system msgs to visual differentiate them more?
Yellow for kill msg?
Blue for capture/object damage msg?
Grey for action verification like bomb door opened?
But to me, the kill msg seems as valid as any of the other current system msg, maybe more.
It worked well in the early days until we got to about 500 players. Hmmm come to think of it, maybe the beginning of the decline correlated with the removal of it. Hmmm, interesting.