I worked on js and php once, and now I work on AI. The tech market in NZ is very limited so I imagine anyone working for Xero in NZ has better-than-average odds of being there just because its a job, rather than because thats all they know how to do (or all they want to know how to do).

Maybe without Xero, they'd be out looking for and learning new things, starting new companies, etc. That's what I would do if I worked for Xero (which was conceivable, at one point) and they closed down.