Did it go somewhere?
(I generally prefer more declarative diagramming now — mermaidjs is my go to — but Visio is still around and widely used.)
Lost it's ubiquity.
There was a period in which you could rely on almost everyone to have it, which made it an attractive, convenient and low friction way to share diagrams that people could edit and update.
https://support.microsoft.com/en-us/office/use-visio-on-a-ma...
Otherwise it has all critical modeling methods and established a shared visual understanding. I prefer UML any day over eg lucidchart or Visio. Not that they cannot draw an architecture but boxes are what exactly again there?
I especially like UML because there are no AWS logos and database icons. When drawing diagrams I am not there to impress how many icons I can do.
That's what the argument is... and I'm in favour, there used to be such great architectural tools that were mostly UML but they did this well.
I miss Visio, it was awful but everyone used it and it improved communication.
I feel Google Suite is missing an equivalent, it's now draw.io, there's a real gap here.