Hi @Pawelek85,
I am sorry you feel frustrated. Most of the issues you described sound like user support issues:
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Installer doesn’t see templates … it worked before on that very machine. 99% it’s your media / corrupt download. When the installer boots it offers to check the media. Did you?
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Your recent sound issues … it worked before and now it suddenly stopped working more or less simultaneously on three different machines you have. Can you connect this to an update or did you maybe install/configure something recently?
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Split-Gpg … at which step in the instructions does it behave differently then you expect?
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Your 4k Monitor … likely a hardware limitation. Did the monitor work on the same machine with a different OS?
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External audio/graphic … I can see that this could be difficult, but probably not more so than on any other Linux.
Others sound like you are actually (attempting) to use functionalities that are explicitly marked as ADVANCED USERS ONLY (minimal templates, dom0 changes, inter-qubes networking) or TESTING (sys-audio, sys-gui).
Standard computing with Qubes OS on supported hardware is not much different from the experience you’d get with other Linux/Windows/OSX installs. Many of your use cases are difficult because they are attempting to use something that doesn’t exist on these other platforms – compartmentalization.
Finally I must ask: what do you expect?
You are comparing Multi-Billion-Dollar Juggernauts (Apple, Microsoft) with many thousands of employees to a FOSS project run by a handful of heros giving you abilities to secure your computing that are only rivaled by semi-secret military projects.
Pretty good deal I think. 