Blood Legion might have more alts than any other guild in the world. They stack their raids every week with, lets say 5 'main' raider toons, and 20 alts. (I don't know exactly how they do it, but I do know this is roughly correct) All gear goes to the main raiders toons, and they get their raid geared ~5x (RNG dependent) faster than anyone else in the world who doesn't do the same thing they do. They also raid the content 5x more often. They probably play the game and raid more than (or at least, as much as) anyone else in the world. Everyone else has the option to do this also.
Why doesn't everyone complain that this is 'required'? Because it isn't.
Just like if they brought split lockouts back, it wouldn't be 'required' to run both 10 and 25 if you didn't want to, or you weren't in a position to. Just like LFR really isn't 'required'. Hell, I got very little actual raid gear on this toon from drops, and I already don't need anything from MSV LFR - that's two ques off the list that I don't have to do any more, and it hasn't been very long since they came out.