Because there are innumerable posts and threads on "how do i do X on rxtoolz" or "halp rxtools update" etc. etc. when most issues people have with RxTools could be fixed by simply switching to a better CFW.
I personally have no issue if people choose to use RxTools for whatever reason, but if you have issues using it, then it's really your own fault, and should probably just switch to something like Luma3DS to save yourself and everyone else the trouble.
The thing is, I'm pretty sure that this is OP's point; that people should stop using RxTools because there are so many people having issues (and continually posting about them) that could be solving by switching to another CFW. People seem to have ignored (or not even bothered to notice) this point, and just assume that OP is trying to force a subjective view on other people, which they're not doing at all (at least in my view).