You wouldn't, it's just a "cool" little project. The only advantage this has over a normal server that I can think of is size and power consumption.
Install a base OS, then docker compose a few services. Or buy a half dozen and deploy k8s.
Boom, "A cheap tiny personal server self hosting" (with COTS parts).
I'll make a post with the parts list and software install steps in a month or so if it would help anyone out. I bought https://www.amazon.com/dp/B09GK2QSY1, and a few alternatives, and I'm going to benchmark their performance under heavy load (using a much studlier machine to generate traffic).
These mini PCs are getting to be _really cheap_. Cheap enough that my home infra is moving towards a tiny mini PC ($100 or less) attached to every pair of monitors, keyboards, and the network, and a central server to do actual work.