Consider also that anyone can really get their legendary cape. If you can do it only on normal or heroic (or gasp, only heroic 25 man!!) it means the effort you had to put in getting the reagents is higher which means the reward is higher too. Right now, I have a very easy time getting the cloak on my alts in LFR, while my alts cannot get in Flex groups cause "too low ilvl" which means I have to resort to easy mode which does not drop much if anything, except for reagents.
There is something to say for both arguments and I suggest all those who have a firm viewpoint to try and understand the other PoV and think outside of the window.
And in the end this is the system we got now, the one of multiple difficulties for multiple playerbases. LFR is the easiest, and most of those who complain throughout this thread aren't the target base.