Think about it this way: Okay, you got burned by Pulseaudio. But why was it your job to debug these issues? Why was it your job to decide to go back to Alsa, rather than fix them?
Now when a distribution decides to provide multiple configurations then it's also the distribution's responsibility to ensure everything works correctly. When a distribution like Gentoo decides to shift that responsibility to the user, expect to be burned - but don't expect upstream to be friendly to you.
Same for systemd. No end user should care. System administrators sure will care, but 99% of sysadmins I've talked to love systemd... so that's not the issue.
As a Linux enthusiast I'm sorry that this is the state of things, but this is the price we pay for customizability. This is the price of being able to change every little setting, every little modular bit of software, every library providing imperfect 90% compatibility with every other library.
Pulseaudio/systemd complaints are IMHO a symptom of a far worse overarching issue with Linux. They showcase the failures of direct democracy. The lack of context that users have and give. When a user says "I want to stay on Alsa", what they really mean 99% of the time is "I had a bad Pulseaudio experience that one time, and I heard a ton of bad things, so give me Alsa". Those same users don't understand the difficulties of supporting, in alsa, configurations that they don't necessarily use such as bluetooth headsets; configurations that other users ask for.
Thus, the failure of direct democracy: "I want what works for me, not what works for everybody".