The problem is that mobs and players only support a certain number of buffs/debuffs at all, regardless of how many are displayed. I think it's 60 total, 30 displayed. Debuff #61 doesn't even land.
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Even then, think about it:
There HAS to be a limit at some point or you can literally one shot enemies with debuffs because the tick would be so large it just collapses. This is why in normal circumstances you'll almost never hit that limit, it's literally 1%..2.5% content at best that even this would become a problem - Most of the game's progression is 8man, which is what it's tuned for with some breathing room so to speak.
I have to second this thread, lately I'm seeing the debuff cap be hit frequently in ST and in Hunts. Any player who focuses on debuffs as part of their rotation will not be able to play as effectively as others. I disagree that there HAS to be a cap because monsters should be tuned to the number of players participating in said content and not the players tuned down to make the monster harder but that's only my opinion. In my opinion the debuff cap is not a problem in 8 man content but for any alliance based content it is definitely a problem and considering the sheer number of people participating in ST and hunts I don't think that it's irrelevant.
I know that >.<, but they do technically apply you just don't see their timer. When I smn through ST I just apply my dots right away and then make sure their timer never runs out so I never face this problem (I know that's not practical for some other classes). The reality is though you don't have to pump the best dps to make a ST run go smooth, so until they actually make difficut, high dps requirement 24-man content this really doesn't matter.
It would be nice, if the newest debuffs took priority over the oldest debuffs, and essentially pushed them off. This would solve all the problems above.
The trouble it's every class land debuff, 2-3 different debuff for most of the class. on some class that can be annoying, but on class like Summoner it simply killing the class, since the dot it's 1/3 if him dps.