“One day, in the deleted scenes, you will see there’s an alternate version of that, which is opera,” Goldsman tells TVLine. “But [co-showrunner Henry Alonso Myers] and I were very much married to the boy band thing.”
I mean, the opera version was 100% what I was expecting, although I guess in retrospect there was no specific reason to suspect that. The boy band version was, however, the funniest/best version possible
It was also more in-line with the story - Klingon opera doesn’t really belong in American-style musical theatre, while it’s easier to slot this sort of pop into that style.