also, to quickly throw out a point (since I am now seeing redditors mad at pyro nerfs, god bless them):
valve obsesses over data. we're already well aware of this, look at any blog post mentioning changes in CSGO and DOTA2 and they talk about it all the time.
knowing this, keep in mind that the data valve likely has on pyro will consist almost entirely of degreaser/stock/powerjack, and nothing else. calm the fuck down, look for the long term here