Bad implementation.
Either you make everything that drops from mythic raiding legendary or you don't just drop legendaries randomly.
I think raiders (people committing to the game) should have this 1st before anyone else.
An mmo should be about the more you do in a game the stronger you get and not just an Overwatch version of Wow where everything is balanced and everyone has the same gear and just some people have better achievements and ratings.
Also I guess blizzard did this sort of to force people run HC's etc... well guess what... it doesn't fix anything. Raiders will still form their own 5 mans running through useless content (for them).
Note I AM NOT A RAIDER, and hence I wouldn't expect a legendary nor having good enough gear. It just saddens me that this game is getting away from an MMO-RPG, towards to something like a moba or a 1st person shooter, where people don't really need to play the game to be able to do things, they just casually need to log in here and there do a quest do a simple dungeon and thats it, they have very little differences to people that spend a lot of time into the game doing hard things.