Obviously I can't speak for others but here's why I dislike it.

PulseAudio has always close to worked perfectly for me, there were some cases where it didn't work and that typically required a lot of work to fix it but for me it tended to have worked. This is in no small part because my system is simple. No login manager, just myself in the audio group.

Many people report that PulseAudio doesn't work for them however. And this is a similar trend with a lot of Red Hat/Lennartware. It often doesn't work. Why? Because this stuff is tied into a thousand configurations everywhere on your system which all need to be just right in order for stuff to not horribly break. This is a thing it shares with software such as systemd, NetworkManager, Avahi, Gummiboot and all that stuff.

In their attempt to create "just works" when everything is set up exactly right they created a fragile house of card that comes falling down when settings are only slightly off from what they want them to be. All these tools are basically designed with Fedora's target audience in mind. People who will never change a single thing about their system. Yes, if everything is set up by the distro and they accounted for all the hardware then it "just works", but if it doesn't "just work" it takes forever to diagnose and repair the problem.

Also, as far as PA goes, it has higher latency than bare ALSA.

Another thing that makes me more suspicious is that virtually all of this tech originates from Red Hat or GNOME-controlled Red Hat, and a company that likes to sell support of course wants a Linux that constantly breaks and which you can't figure out without a dedicated support guy. With this shit, RH is creating is very much creating a system where it becomes all the more attractive for companies to invest into their support contract, and I doubt that's not a bit on purpose.