Plenty of people talk too much on their mic making it hard to hear. But a lot of those guys that don't miss them in this thread play vs almost exclusively, where vocalizations aren't as useful as a mic for general communication. I don't give orders for that reason.
However, on the flip side, if you need to tell your teammates you are being pounced or smoked every time that happens because they can't hear the sound effects and music (where they could if you weren't going OMFGHELPMEPOUNCE), then they are shitty at the game anyway. It works both ways; people can spam stupid crap via vocalizations, not everyone does. Some people can spam stupid crap on their mics and make it hard to hear the game too, not everyone does.
I used the ones I had for utility; I can't always read what is being typed during some situations, but I could hear a vocalization or mic. Now, one option is completely removed. It doesn't help anyone since the stupid spam people now have a smaller pool with which to annoy people with. And if you are still playing random games with people that do spam, get some more friends, the games have been out for over a year. Try taking some initiative and make friends that don't do that shit instead of being a generalizing douche saying "everyone just spams them and you should get a fucking mic".