Why would you get a sexy black glass case to display such terrible cable management?
I personally love the Trident Z Royal Series. I actually think it was executed in a very classy way.
unfortunately this is normal for the 9900k once overclocked.
You say you were considering AMD for Premiere but it's even more poorly optimised for AMD CPU's than Photoshop is. For example the 8 core i9 9900k beats the 16 core Threadripper 1950X in most benchmark tests inside Premiere. You made a good decision either way. Nice Build!