How difficult is an HA cluster? Because that’s more of a fair test. Setting up a dev-only instance of anything ought to be easy.
It's not rocket science, but like any complex computing tool it requires dedicated attention especially if you are going to run more than a handful of clusters. A lot of the tooling in the ecosystem falls flat here, it all solves the Day One: Getting Started problem but often punts on Day 2: Operations and then once it realizes it is actually a problem hamfistedly engineers a bolt-on solution.
So back to my point: Provisioning and setup easy... maintenance moderately more complex.
It gets a bit more complicated when you automate it and support adding/replacing nodes - the uploaded certs are valid only for 2h for example. (IMO the easiest solution to that is manual cert distribution - i.e. just scping them to the joining nodes.)