Why is Burnbrand bad for zerg play?

[Lonewolf Kai.3682]

My commander informed me that my burn oriented firebrand is really bad for the Zerg and ends up benefiting the enemy more than helps my team. I didn’t really get into why because I had to log off but I’d like to know why it is considered a bad build. He mentioned something about handing them free aegis every time I hit them with a burn stack. So why is burnbrand so bad?

Edit: I think I figured it out. It’s because of Engie Purity of Purpose. And every organized Zerg runs several engineers for that.

[Stand The Wall.6987]

don't bomb them on engage but when they are kiting.

[Dawdler.8521]

"Several engineers" is a severe understatement for most zergs. Fact is condi is nearly useless against a zerg. There is one aspect that's... well, "usable"... and that's as a single/small target flanker. At the end of the day, you as a firebrand is more useful in the zerg itself on minstrel support. Commanders will literally not care how kitten you are at support firebrand - they just want firebrands. There are others that can do the flanking - thieves, rangers, other roamers.

[Laila Lightness.8742]

For you basicly grant every enemy engi aegis