Only the last 2 bosses in the raid are 233, and you don't need full mythic gear to do +15... We routinely did +15s in normal/lfr gear mixes...
"Never"
13 weeks for guaranteed loadout isn't never. It's probably still well before new raids drop if the past xpac was any indication, since it was like 6 month patch cycles.
Besides that 210 is virtually 213, and you can farm that up much faster than heroic tier raiders will get their loot.