I agree with the sentiment but want to point out that the biggest drive behind UML was the enrichment of Rational Software and its founders. I doubt anyone ever succeeded in implementing anything useful with Rational Rose. But the Rational guys did have a phenomenal exit and that's probably the biggest success story of UML.

I'm being slightly facetious of course, I still use sequence diagrams and find them useful. The rest of its legacy though, not so much.