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Intel Ethernet I219-LM: Look for a setting like “LAN Option ROM” and ensure it is enabled. Could be it works with Windows drivers but Linux needs that to be enabled.
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HDMI sound over DP it is as it looks like Display is connected with DP ? Best way to resolve audio not piped to the correct output is to use pavucontrol (Gui) go on configuration tab, disable all other devices (set tem to off profile in the dropdowns) and only enable the one you want the output to get piped to. The device will be named as your GPU mostly and you will have a profile dropdown were you have to choose hdmi 2 output.
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DAC usb could be it needs an out of kernel driver or option set it is not listed in the inxi output i think may show the output of
lsusbwill show better info, or unplug it open a terminal runjournalctl -fand check what it outputs when plugging the DAC in this will in most cases show good info to fin the device model and stuff that goes wrong.
And yea truth is that going for EndeavourOS only give you a bare minimal setup to start with, but it gives you also total control, no need to debloat in the first place, and a wide range of users willing to help with every thing to resolve and setup.