I wouldn't use it as my primary system. But I do keep some of my old laptops to perform experiments on. e.g. running minimal NetBSD, Alpine Linux, etc.

My primary system is a beefy desktop running Debian Bullseye. I'm wary of installing unproved software on it. So I first install unfamiliar software on a spare laptop, sometimes with a clean OS install. If the software works as desired then I install it onto my primary system.