Email service, Dns service (64 lines of code), File service, Image service - to name just some of them. Those are essentially little wrappers on standard libraries exposed as REST services.
In the DNS case is basically DNS over HTTP which might not be useful to you since you can implement it but to someone who doesn't coslde it's useful.
Image service is storage and serving on top of micro which arguably yea you can do elsewhere and the wrapper to imagemagick you can do yourself but we've found there's a ton of people who just don't want to reimplement this logic.
This is the most succint argument against kubernetes I've heard yet.
You mean like string concatenation? Come on man. As far as evolution goes, that’s what semantic versioning is for.