They might ask for 705, but expect 720. I've tried to join mythic dungeons groups where I'm 20 ilvls over the requirement, and still get rejected, and I ALWAYS have to look for grps for like 10 minutes before I get accepted. Maybe my mains, ret and fury, are not worth shit to these leaders. I could start my own group, but I don't feel confident to be leader, because I don't know the fights for all roles, and I can only watch youtube or read about them, no actual experience from other classes. My friends have quit playing years ago, but I casually play, and will continue to do so. The only real way for me to get any content done, other than the random charity spot from the guild, is to use the group tool, since I can't dedicate me to game as much as I could back in the early days. I don't want a carry, just a chance to contribute to completing a dungeon or raid, but that's hard to get into, because my metrics aren't super attractive to leaders.
LFR is the reason that I have completed a lot of the end content since Cataclysm. I think they perfected it with MoP, where you HAD to know the fight and also was rewarded for it as well. WoD LFR is just a cheap experience, and not worth the time. Bringing that back in Legion would make the grouping nightmare a little less mandatory.