So what you mean is "Systemd still has serious bugs," which is nothing to do with whether or not everybody is moving at once.

That's the point – if systemd has important bugs they should be fixed. Clearly, the groups responsible for the decision have concluded that the tradeoff is worth it, and have accepted that a large, fundamental change will have issues. That's fine – there are a bunch of other distress you can use that have not adopted systemd, which you can use in the meantime if you disagree.