Is this a "why do anything at all" kind of moment?
It's a "why build something functional into a PC case that doesn't enhance the function of the PC?" Not a "why art?"
As I think we've established, I'm not even a big fan of RGB, though many are. I guess we could lump this in the same category, and my guess is that if you like RGB you'll probably like this mod.
I've been contemplating
functional mechanical enhancements to a PC case, and about the only thing I could come up with is having variable air duct geometry that adjusts depending on the machine's overall cooling needs or perhaps whether the cooling needs are greater for the CPU or GPU.
Think about the utility of the PC for decades. Beige and black boxes, some horizontal and others vertical. Entirely utilitarian in function, and unattractive in most spaces.
For me, PC case evolution basically finished with positive-pressure black aluminum cases with removable dust filters and bottom-mounted PSUs. I guess a few more interesting things have happened since optical drive bays started getting removed from them, but I still use optical drives and thus don't pay as much attention to such cases.
Some other innovations I like are Thin mini-ITX and mini-STX. It's too bad there aren't more such boards or cases. I really hate how most mini-PCs seem to have nonstandard parts. I wish there was a vibrant ecosystem of standard form-factor, NUC-sized boards and cases.