Said in the Q&A from today.Personal Loot is the desired loot rule moving forward.
Most raids used master loot for tier which is not in BfA.
Will we be seeing Master Loot leaving the game (for now)? I can't see this being efficient at all for most progression guilds, especially since it's going to completely get rid of the majority of the guilds' loot system.
Edit: Clip thanks to Dredglol
https://clips.twitch.tv/RelievedBetterCrowSwiftRage
edit 2: holy shit, please do yourself a favor and not make yourself look fucking silly by watching this 30 second clip before making a witty (hint: you're not witty or original) reply about the wording of the quote in the first two lines