I don't know much about it, but even from my position of ignorance it's clear that the level of debate is very low.
There seems to be a line drawn where those that do web hosting and similar love systemd, while other server admins loath it for introducing needless complexities.
I have taken to thinking about web hosting as "uptime by machine gun". This in that they achieve uptime not by maintaining solid server configs, but by rapidly firing containers and/or VMs at the problem until it goes away.
I guess the debate is so toxic because it's a perfect bikeshedding topic everyone that uses Linux can somehow participate in. Some sysadmins are surely frustrated because it breaks the way they worked in the past years, others are happy about the new features.
I'm undecided but if I read this https://news.ycombinator.com/item?id=11675129 I'm really feeling uncormfortable. Hitting this and debugging it seems like a nightmare. So I guess it's a win and eases a lot of pain points for ordinary users but make the live of specialists a lot harder. I can imagine how you hitting these bugs regularly turns you into posting something in the angry territory.
On the other hand the debate is now mostly technical (except some trolls).