Its the same as why you see everyone using LS and crossbows. They're reliable powerful and quick firing as well as cheap (the at2k, not the crossbows). Plus the compact tank makes it easy to integrate.
In conclusion, if you don't like the way mods are going on this site SHUT THE FUCK UP AND DO SOMETHING ABOUT IT. Don't just sit on your ass and bitch about it. People like you are why this country is like it is.
Plus saying that everyone uses it takes away the creativity is like saying an artist cant make anything good with paint because everyone else uses paint too.