The effort you put into heroic raids far more than what you'd put into a a mythic+ to obtain the same ilvl gear. There is a disparity between those two systems and it needs to be fixed. No, not really. Considering the amount of RNG and probability. You need to spend far more ...
I raid AOTC and midway through Mythic each tier. We get into Hc fairly early, but take a while to progress into Mythic. So M+ is really beneficial for me right now, because I can get higher ilvl loot than I can in our current raids, and we're only downing a few bosses a week ...