Some people pickup hotswap PCBs because they like to change up the builds in their boards. I typically have anywhere from 2 to 5 different plates for each of my boards, and I like to change up the builds in my boards quite often (switches, plates, foam config etc). I don’t want to have to desolder the old build and then solder the new build each time I change stuff up, so I like to get hotswap PCBs for my boards. This does not make them kids toys, just simplified the process of changing builds. Hell, I have hotswap PCBs for some of my most expensive boards.