It is hard to say if the killboard is making some players change their behaviour, same for the when addon Damaz kron got added on live suddenly some players seemed to overly care about their K/D ratio to the point of only picking winning fights.
Players are naturally free to play as they want, but the original gamedesign seem to be based around casualties (see how fast this game allows someone to be ressurected compared to DAoC, and how minimal the ressurection sickness is to clear at the healer) to me that shows that this game was designed to be chaotic with back and forth momentum swings, and not this 15min bashing on targets to get one kill situation we have in ranked.
As for the killboard, it is very Damagedealer focused. Before our guild summer break i was joking about not having our tanks and healers in the guild if we wanted to care for our killboard K/D ratio simply because only the damagedealers are counting on the board, and if you do a full wipe all of the support classes will only count towards the deaths
The killboard is nice, i like it, and its handy for some data. But it also doesnt paint a full picture and is very easy to abuse if one should care.
Removing deaths from it, could maybe be a option to head in the way of the original gamedesign and whomever is already playing the most will just be on the board. just like it is now, kinda. But the extra layer of "oh no my K/D ratio" fear might fade abit from some players. Who knows.