SUMMARY

- The System Settings in KDE plasma (and in extension, the Sound widget) don't show all the active sound devices and don't show all possible configurations.
- I thought I had a problem with my devices, but when I opened ALSAMIXER, I saw all the connected sound devices that were "missing" from the KDE Plasma sound settings page.
- While I totally understand that the page doesn't show the many unconnected sound ports on my tower (like S/PDIF, Rear Mic, Surround, Center) which are not in use (but still shown in alsamixer), the setting page also refuses to show the speakers while my headphones are connected in.
- This behaviour may be obvious on things like a laptop/phone where connecting headphones mutes the speakers and only provides option for controlling headphones, but on a desktop it is irritating having to UNPLUG my headphone in order to use the speaker and even control it. 
- I would rather simply want the option to CHOOSE ONE OR MORE CONNECTED devices (like speaker AND headphones) to playback from (at the same time, if I want to).
- I had to look in multiple places before realizing that there is a setting called "auto-mute mode" in Alsamixer which needs to be disabled in order to playback from multiple devices. The settings page can also expose this as a toggle.
- HONESTLY, the alsamixer TUI is pretty well designed. The Audio settings page in KDE plasma can be modelled after it, while the "taskbar" widget can remain a bit simpler to use.

PS: Sorry, I didn't know how to separate the above into "steps to reproduce", "expected result", "observed result", as it involves more than just a bug report. It is a bit of a bug and a bit of a feature request.

SOFTWARE/OS VERSIONS
KDE Plasma Version: 5.25.5
KDE Frameworks Version: 5.98.0
Qt Version: 5.15.3
Kernel: 6.2.6

ADDITIONAL INFORMATION
Motherboard: http://www.gigabyte.com/products/product-page.aspx?pid=5497#ov (this has speaker output)
Frontpanel on tower has headphones output