Yes, because to be frank, typing out any math without some sort of notation system in the Stack Exchange software is a pain. And I don't necessarily think it's "overkill". While some users might not use it a great deal, most of my work is either mathematical biology or mathematical epidemiology, and talking about predator-prey models, epidemic models, etc. - which don't really have a home to talk about their substance rather than their implementation outside of this site - is essentially impossible without typing out some math.
More to the point, deciding not to have it I think stakes out a somewhat dangerous position that this site isn't interested in questions regarding Biology that require heading into any math more complex than high school algebra.