Well theres a few more:

* coalescing jobs with control over the granularity of it. That means you can say "i want this job run on at 14:30:02 exactly" and I want these jobs run at 19:21 or so, 19:22 or so: and 19:23 and set your resoultion to 10m and they'll all run at once. Great on laptops and other scenarios where you want to reduce power draw.

* System wakeup - you can wake a system from sleep various sleep modes (details depend on hw support) and run a job.

* cohesion with the rest of the system. this is a big deal when you stop playing with just your desktop and pet server and have to deal with 10^4 or more servers. having to deal with the wierd quirks of cron vs inittab vs whatever is frustrating and when there are many people working on it, someone is always going to do something quirky and fragile. Yes you have to know the systemd things, but that's it - a timer starts a unit, any unit, without all the bullshit (e.g, oh im stating with cron, these magic invocations are neeeded, oh im starting it with runit and these different invocations are needed, etc)

I literally never experienced any of the problems people complain about for pulseaudio - at the time it was released it was the smoothest audio experience i ever had on linux. I think some people just want to look cool and complain about the new thing.... But also I read manuals and think for 3 or 4 seconds before doing things, so maybe it has something to do with that.