[TeMPOraL]

I don't think this holds. As the rule goes, there are only three cardinal numbers: zero, one, many. What are the chances you product has only two meaningful personas - "users" and "developers"?

Take that payment system. People who buy things are obviously users, people who write CMS plugins for that system are obviously developers. But what about, say, analysts studying reports from that system? Accountants making sure the money flows where it should? Sysadmins keeping the backend components running? These are all users too.

Where UX makes sense as a broad concept, giving a separate acronym to one small subset of potential users... doesn't make sense.

[zeroxfe]

It's perfectly reasonable (and quite common) to have acronyms for your major personas, and generic terminology for the tail.