There's precedence for one-shot mechanics in normal. Off the top of my head, Exdeath, Kefka, and Omega M/F could blow you off the map to certain doom. Titan's trial can have you fall off the edge and not be able to be raised so if anything, things have gotten better. Once more people realize how the mechanic works, it will be easier. We're only in the first week and it's new. If all content including normal raid could be face-rolled immediately with no consequence, the game wouldn't be very fun or engaging.