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It was possible in WoD too, but the game mechanics needs to be changed, so the raid could be soloable.
Unless Blizzard have been changed it with Legion launch, we have at least 3 encounters there, which are not possible to be soloed, due to technical limitations, and requirement to have several people to do the stuff in the raid.
Like the two turrets, the event, which require 3-4 people to be started, etc.