Theoretically, you can get 5 pieces of BiS loot every week.

2 chests in T1 and 2 chests in T2 plus your normal myth hand-ins, totalling 5 pieces a week. Not a bad thing in my opinion but whether you can actually get loots is another story, so I don't really see what's the problem, particularly when most people complain how many people are under geared for most contents (including QQ'ing about lack of gear in WP... geez)

Yoshida did say the whole population of FF14 has around 50% of people having not a single piece of Dark Light gear, this strategy helps improve that %.