sysV init or sysV rc? OpenRC can work with any basic /sbin/init or provide its own. If you rely on sysV rc scripts there is probably some backwards compatibility, or at least was in older versions, but I don’t really see the point in it. What distro does even still use sysV rc?

These days OpenRC even has user-services. And writing a simple OpenRC service file is barely more complex than a systemd unit file, maybe even simpler, because it’s readable bash, not some declarative DSL.

Obviously there is in no way feature parity between those two, that’s the point, personally the one thing I’d like to have is something similar to systemd’s timers (which I actually prefer to old-school cron) built into OpenRC, but most other things I can live without.