[chlorion]

openrc-init can be used on an upstart system, the daemon manager itself can't but that's because you'd have two different daemon managers. Beyond that there aren't any openrc software components, because it was designed to be a modular init system that just handles what it was intended to handle.

The rest of the system for example chrony, sysklogd, cron, etc run fine on upstart systems, because they aren't tied to systemd and are fully modular.

It's okay to be a monolith, that doesn't make it inherently bad or anything, but we should be honest about it, and it does come with some tradeoffs.