Contrary opinion: USB-C sucks for any sort of demanding use case, especially video (i.e., gaming monitors). There are so many different versions and specs that all fit into one lookalike cable/connector but which will fail in various ways, usually at some combination of refresh rate, resolution, HDR, etc. HDMI is so much more reliable (though not without its issues) and DisplayPort is even better, though that's rare to see on a laptop. If your monitor supports a USB-C input, there's a good chance it will work with your laptop (especially Windows), but the situation on Linux and Mac can be very different. If it only has a HDMI input and you don't want to waste time exploring the different USB-C video modes, a HDMI output on the laptop and good cable will make it much, much simpler.
Audio is probably fine... the standards there don't change as much.
Ethernet is hit-or-miss for me. On my Macbook with an expensive ($300ish) dock, the port works 90% of the time... 10% of the time it'll just randomly shut off until restart. Another USB-C ethernet dongle (with only that one port) works 100% of the time. But either is a PITA compared to a built-in ethernet port in the laptop.
I don't have a choice now that I've gone to Macs, but if I were buying a Windows/Linux workstation PC, I'd absolutely get all the ports I can – ESPECIALLY HDMI and ethernet. USB-C is a nice idea with terrible real-world implementations that are usually 75% compatible but almost never 100%.