It's not just debian/ubuntu/rhel, almost everyone has moved to systemd, even Arch Linux and Gentoo. As much as I agree with the ideas behind Devuan, knowing and understanding all the intricacies of systemd is now required knowledge for anyone doing Linux-based software development or devops. After putting it off for a while, I've moved on and have learned systemd. It's not the way I would have liked for the Linux ecosystem to have moved (I thought upstart was a decent base to build on), but I'm clearly in the minority here.
What's bothering most at this point are the binary log formats. But that changes from week to week. But it's here to stay, so I'm getting used to it.