First thing, I'm aware of the existing dark skin in CF2.5. Here's a picture of it:
Obviously not usable. Even if the action boxes and event group headers were fixed, and the lack of contrast between certain elements addressed, there'd still be the windows elements not being touched at all. Windows 10 has recently added dark mode for windows explorer, and it affects every single windows element that I can see. Here's a picture:
Despite CF2.5's interface using the windows API, it does not update for dark mode. Eye strain has increased for me significantly once I got a 144hz monitor.