The problem is that some factions in the non-systemd camp are pursuing systemd "emulation" by using shims and forks. That way you just get a second rate systemd, and it will remove any motivation from upstream projects to support anything else than system. Using Ubuntu's "logind" is a short term gain, but a strategic failure for the non-systemd camp. They need their own implementation of needed infrastructure, not just copying or emulating systemd.
It sounds a lot like the non-systemd camp have no idea what they are actually for, they only know what they are against. So this kind of thing is not surprising to hear.
The "UNIX philosophy" is an empty slogan that switches people's brains off. It sounds great, until you try and build a real system with the features modern users demand, and then it turns in to an exploding nightmare of combinatorial complexity as every program tries to abstract itself from every other program in the name of political correctness. As already noted elsewhere, the programs people use serverside Linux to actually run barely resemble the UNIX command line tools and that's for good reasons