[Fnoord]

I see parallels with discrimination.

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.