It is banned for commercial transport.
And I know 4 pilots that lost a rear turbine on approach in sub 500ft wx. Using pt 6 and tp 331's. You won't read about the failures in twins. But they do happen. The reason why you don't read about them is because there isn't a crash.
Single engine min approaches are extremely rare in the grand scale of things. If there was statistics kept for the numbers even if it had happened once it would produce an unacceptable accident statistic. Similar to Concorde going from one of the best safety records to one of the worst in one crash.