no disrespect intended to Ranger, but I'm pretty sure HTC could make similarly improved explosions themselves if they wanted to
they just haven't done so yet, for whatever reason
For the same reason they are not making new maps and skins. They are busy doing other things that they feel are more important. to the game.
While I'm a big fan of Rangers work, you have to admit it really doesn't matter "what" the explosion looks like, but that it blows up.
On the other hand, I don't know how much trouble it would be to add the stuff that Ranger makes. I would like to think that if Hitech gave Ranger the parameters that he needs to work with in, and Ranger was willing to sign off all of his stuff as a "labor of love" I don't see way HTC wouldn't let him do a bit of the small things like smoke and explosions.