Call me elitist, call me what you want, but I HATE idiots going afk in LFR.
If everybody went LFR, or everybody slacked half afk, everybody didn't put any effort in, the bosses no matter how hard/easy would not die.
Furthermore it takes longer and longer if people are doing horrible dps in horrible gear with no gems or afk etc
If I do LFR I do it on wednesday when raiders are doing it, or using openraid/other mediums to find a semi-premade. I also promote kicking anybody that slacks.
If you want to slack or go afk, dont join a raid instance, play an even more casual game or just queue later.
LFRing with entitled afker/slackers on alts makes me want to quit the game altogether.