Ive been runing Debian 12 (kde) since bookworm was released and am loving it.
I have recently discovered Devuan which seems to be Debian without systemd - what is the benefit of removing this init system?
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It's been the default for ~10 years and it hasn't been an issue yet.. Even if it did "fail" the solution would never be to roll an entirely different init system. That would be absurd. If there is a bug, it gets patched.
You can run services independently of systemd. There is no reason you couldn't have whatever feature you want and systemd at the same time.
When vulnerabilities are discovered there is disclosure to maintainers, a patch is released, and then an announcement is made publicly with the instructions on how to fix the problem. I've never seen an instance where the industry collectively says "There's a vulnerability here but we aren't going to fix it. Good luck!" Especially for such an important layer of the stack.. There's no way that is going to happen.