Actually, I don't know.

I have used KDE in Arch, Mint and openSUSE. In all of them I had to uninstall pulseaudio, because my sound card has never been, properly, recognized and by installing some packages and use the desktop, finally, the system loses the sound. Always I have solved this by uninstalling pulseaudio, and then the system detects, properly, the sound card, showing all channels' sound.

What is the purpose of pulseaudio? I have read some information related to this, but they are too detailed and complex.

The only thing I know is that pulseaudio, always, is annoying me.

I mself am confused of its purpose. And I guess nobod here uses it that much

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My sound works out of the box with Pulseaudio, and I can change the input and output media quite easily with it. Your mileage may vary, and it highly depends on your hardware and how your distribution implements it, but if your distribution sets it to default you better not remove it, as that will for sure break your audio.

Alsa can only play output from one source at any given time. Iirc pulseaudio is another layer on top of that which enables any number of sources to access the sound card at the same time.

Whether or not you find it useful therefore depends entirely on your needs...