I’ve spent like eight years with Ubuntu and realize it’s all symbol manipulation to me. I learn what is and goes where but all in practice and never because I understand the semantics.
https://www.freedesktop.org/wiki/Software/systemd/TheCaseFor...
He's even added a warning to dpkg and a "usrunmess" tool to switch a system to his preferred way of doing things.
It's not clear to me where the breakage lies and I've not seen any actual reports of it.
For more context see https://lwn.net/Articles/890219/