I would almost define "experience" as that which can't be described by UML.

Ask any person to go and find a stick and use it to brush their teeth, and then ask if that "experience" was the same as using their toothbrush. Invoking UML is absurd.

You know some of us old timers still remember a time before people just totally abandoned the concept of having functional definitions and iso standards and things like that.

Funny how we haven’t done anything on the scale of Hoover Dam, Three Gorges, ISS etc…since those got thrown away

User Experience also means something specific in information theory and UX and UML is designed to model that explicitly:

https://www.pst.ifi.lmu.de/~kochn/pUML2001-Hen-Koch.pdf

Good luck vibe architecting