If it is some obscure compatibility we are talking about, I can understand it. If it is a defacto or official standard, then no. Regardless of whether I use Systemd or not (my primary OS uses launchd...), its usage in Linux distributions is currently widespread.

Not wanting to develop compatibility yourself, I can understand. No discussion about it.

Not wanting to include compatibility PRs is a recipe for hostility, and ultimately, a fork. There's a nuance here that it could lead to a lead dev importing PRs for software they don't use or understand but other than that, it seems the way to go if you want an inclusive and gentle environment.

That's a fair stance to take if you're just a group hackers hacking away on this cool open source project in you free time. It's a very bad look when you're trying to present yourself as a serious company that other serious companies can depend upon for some of their most critical infrastructure components.