The cable problem with USB-C I think might be the largest annoyance when it comes to the promise of USB-C. For the highest speed stuff you can only really count on the cable that came with the device because for the extreme speeds you need a good cable with the right length.

(The monitor should have a compatible cable bundled with it though. There's some major cable length limits and shielding when it comes to the highest speed stuff like monitors and eGPUs with USB-C.)