Guild Wars 2

From the staff/maniac magician thread, DuckDuckBoom posted this:
“Having the staff clones give 5 seconds of might can actually be a detriment to other peoples builds as it starts getting rid of the more long lasting might. "

I am still relatively new to the game. I have been reading a lot on forums, and every now and then I read about how sometimes stacking boons/conditions can be bad. Can someone explain the situations where you can be doing a bad thing by helping to stack boons/conditions? As far as I understand, group boons/conditions that can stack do stack from multiple people, so I don’t quite follow how it can be bad. Like, if there are already 25 stacks and someone else is putting on more powerful ones and you put on new weaker ones, you can cause the better ones to drop? What is the stacking order, FILO or FIFO?

I want to understand the finer points of boon/condition stacking, but I haven’t found a place where it is discussed in detail (only snippets here and there). I am really interested in creating a chaotic/random condition mesmer (i know it may not be optimal, but it’s partly for RP and mostly for fun/challenge), but I want to at least understand the nuances of how conditions work. The more you know, and all that…

Thanks!!!!

Just wanted to give this a little bump to see if anyone can enlighten me/us.