I can confirm, it’s a much more complicated problem than it appears on the surface (or at least based on other commenters perceptions of how easy it should be to do this). Where I was even used Replicated to try and reduce the hassle but even that is just a series of different trade offs.

So while our cloud/SaaS offering had a shared codebase there was still a considerable engineering team responsible for the “on prem” packaging and support. Alongside a pretty extensive CI pipeline to try and catch all the nuanced customer setups that had bit us in the backside in the past.