It wasn’t just infinite flame shield. It was bugged shatter that uncapped damage scaling. That will be fixed by next season.
Builds should not need to rely on unintended interactions just to be valid. Not to mention the build was terrible and so was getting gear for it. Sorc was utter garbage. I couldn’t care less about one dude that made some crap build work. That does not make a class good nor fun. Also the gear it took to make work was pretty much out of reach for just about everyone.