I've been a watercooling "enthusiast" for about 20 years now and, while the DIY-ness of the old school builds was a lot of fun for young me, I'm also glad I can just buy some off-the-shelf (or at worst "small batch") components that let me get really effective and near silent performance by just slamming some stuff together.
No more scouring junk yards for a particular heater core from wrecked cars or modding aquarium pumps.
That being said, I also never really understood the "add colorful lights to your PC" aspect of some builds.
I always thought of the lit cases as an instance of "I could put a cool LED light in this space, but I also need the space for my computer ... oh, hey, I could do both".
I have never used a lit case.