Probably not common but definitely non-zero. I'm in roughly the same boat as you (minus the multiple instances). My personal Minecraft server I run on a machin

Probably not common but definitely non-zero. I'm in roughly the same boat as you (minus the multiple instances). My personal Minecraft server I run on a machine sitting behind me at home for friends uses SRV records. I bump the port number each "major" version release (yeah, I know, "minor" version in semver semantics) in case I ever have to run a previous version for whatever reason. This gets reflected in the SRV records. I've never actually had a reason to do this, but it's there if I need to. Or at least that's the theory. I haven't updated it for 1.18. Not sure I will unless I run Tekkit or something in the future.