Le’sigh do I have to break this down…
^ the bold bit is important. Normal Castle was 200ilvl… Mythic avatar is a dps check, which required 255ilvl minimum and thats if you wanted to work your butt off.
Same with mythic guldan if you wanted to kill him in a reasonable amount of time. And quite a few other bosses in mythic nighthold.
So no. 200ilvl wouldn’t cut it without “issue” xD
And yes there is a big difference between lfr and… ding ding… mythic.
The entire premise of my argument rofl