I would never buy a kit that required soldering, because I'm terrible at it. But I like putting things together. I've assembled a couple of DIY keyboards, and I bought a Framework 12 laptop. It doesn't take too long (Framework estimated 15 minutes, but it was more like 45, because I am slow and methodical), and I like knowing what's inside it. The transition from “box of components” to “working system” always thrills me. And, though the repairability of a trackball is not a big issue, it's nice to know that what you put together can be taken apart, for example, to replace an SSD in a laptop.