Funnily enough i was reading this thread at work today, 4 people in our guild has legs- two casuals, a raider and a raiders alt (lol). This afternoon the two casuals got their second leg... We've had 40+ people clearing mythics on mains and alts since week 1. A few of us have been running heroic speed clear groups in our own time... If this turns out to actually be a bug that exsists it needs to be fixed asap.
Imo legion is the most fun ive had in WoW for a long time but this is certainly tainting that experience. Its clearly a poorly designed system even when working as intended let alone whatever is happening now.