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Why does logind depend on systemd?

It's part of the systemd project umbrella? It's part of the systemd monorepo? It uses libsystemd?

Maybe it's simply easier to maintain this way?

elogind exists, if you care. It exposes the DBus interfaces that logind supports for applications to call.

Thus, environments like Gnome can be supported on non-systemd systems if they emulate and/or expose and implement the required DBus interfaces.

That's sort of the complaint, why I accused them of "doing their own weird version of EEE". When faced with a choice of "make everybody else do a whole bunch of work so that they're not forced to use your entire project-umbrella" or "make some minor changes to our architecture so things aren't as tightly coupled" they almost always choose the one that forces you to use systemd.

To the extent that you believe that free software development should work such that random people on internet forums dictate the architecture to the people who are doing the work, and instead of writing their software to solve problems that actual users have, they should comply with these whims, you better prepare to be disappointed.

logind has a stable API, it is possible to build alternative implementations not coupled to systemd, yet so far I don't see much on that front.

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