Well, I could probably kill a whole crap load of treants by arrow showering the lot, because it all goes to one when they get close. But I skilled back to sin at lvl 56 because I like it better. And you don't use pots constantly.
Bows can do a lot of things you don't expect, if you've never been an archer. AFAIK, I invented the long range method of clearing out a deru spawn, absolutely nobody I asked had ever tried it on DIEZ, or had seen it tried, or knew anyone who tried it, so I got a party together and we tried it. Last words from Tam before we started "we are all going to die". Actually, it worked great. I got my deru piece of shell by myself, just using a bow and z r.
To tell if someone is using KOXP, generally, I just watch for a minute or two. If they kill several long range, and suddenly they get that "COIN REWARD" thing spinning over their heads, OK, autoloot in effect, ban the joker. That's pretty much dead certain, if they loot at long range consistently, they are KOXPing. Graphics on bows screws up consistently, but the looting is a sure sign of KOXP.
(Have any archer use a couple of fire arrows, then switch to dagger. If they haven't fixed that one, you'll ROFL. He'll be stabbing mobs with a burning arrow.)