I remember having to use Rational Rose back in the day, and I had to ask my boss why because the software crashed and the files got corrupted all of the time. If it didn’t help them write better software, why were we using it?

That said, I still find plantuml to be helpful, particularly for sequence and activity diagrams. With LLMs especially. Use dependency injection, fine granularity components, sequence and activity flows. At least for me, helps keep my mind organized. But, these days I work alone. I feel it may be too dated for the modern developer.