From a deleted user on CurseForge:

Is there a possibility to sum up debuffs?
If I have 10 times xxx debuff on myself I see 10 Bars. Cant I just sum that up to one bar, with a number in the icon that says the amount of debuffs of that specific type?

Tomber responded:

It should be possible to implement that, when I get time. Can you think of a good way to test it without putting together a party or raid? Sometimes that is the hardest thing to figure out and right now I can only guess that it might be a tanking thing.

The deleted user responded:

I play tank indeed and this occured to me when I tanked a large group of mobs, which all applied a debuff. 
I dont recall exactly, which mobs did this but there should be plenty other mobs who do the same thing basically.
The problem is, every debuff had a different timer. So they dont expire one after another.

If you want I can look for a bunch of mobs in the open world who are suitable for this task? 
Definitely dont need a party or raid just to test this.