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.
I do architecture work here in NZ and Visio is still ubiquitous here - it's part of the standard design/architecture toolkit. Usually the only discussion is whether you need the Pro or Standard licence (Pro is typically only required to integrate with external data sources).
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.