How are we supposed to kill two bosses under 15 minutes when the stronger ones (for example, Karanda Stormbinger) appear? it is not worth the effort to go there just for them to despawn and get little loot.

It has not been worth the effort yo go to any of the world bosses in a very long time, yet again PA missed the mark and just gave to little to late.

One of the strangest ideas yet by PA...... to nerf already dying content......

Why would you want to kill off an important part of the game?  You'd think they would always try to keep it up to date.

Guess they have wisdom we don't understand.....

And they've made it kind of a joke (unfunny): Kzarka just now got its HP magically zapped from over 50% to maybe less than 5% in the last  minute or two, "saving" it from a despawn.  Instead, we got pitied - ! Yay us! (and that 50% also had "help")

And then the sparse loot looks even sparser, now that at least half never materializes as items in inventory. Straight to currency and enhancement inventory. Sure, it saves on maid transfers to where I was keeping things in storage, but I did spend a few minutes tracking stuff down this time instead of swapping over to Karanda (who despawned a minute or two after Kzarka pitied).

The nightmare bosses are going to look silly - assuming we see them at all.

Yeah, there seems to be some kind of hidden rework to the enrage timer to make in more effective at defeating the bosses. From current experience, it's much more effective at defeating the bosses than the previous enrage timer was.

Last night at Kzarka and Karanda Stormbringer was ridiculous, killed Kzarka in 6/7 mins, and then i went to Stormbringer, it was around 60% before it despawned, either PA reduce the HP or i will just go there do a few combos and wait for it to despawn to get little loot it gives, no way we would kill stormbringer with the time left.

oh noes, see no1 does worldbosses anymore, lets save some server load now and remove them

-PA 

Well) at least Kzarka stay in one place and not waste 1/3 of time jumping around like certain dragon) or crazy mining drill. But main thing is that there is nothing of value in loot they drop. Cronmoth for heart, Nouver for outfit(???), hmm???? I guess that's it. Silly, super-time-gated LoL bosses I not even count as their loot is even worse.

That answer is simple. They don't want you to kill more than one boss, they want you to pick a single boss and just do that.