When I bought this laptop the cheap thin clients came with eMMC storage. Keyboard and display are convenient for installations, backups and occasionally other uses. A decent size UPS is more than $100, uses power even when it's in standby and still doesn't last anywhere near the 7+ hours of the laptop battery when the power fails. I'm away for 3-4 weeks at a time and have had repeated power failures completely corrupt my server SSD during that time. Not everyone can fix a server problem within a few hours.

The laptop cost significantly less than a thin client, plus a gpu, plus a UPS and came with that nice keyboard and display, and a warranty. It only uses about 6-8 watts the majority of the time, important to me for a device that's always on.

Different people have different use cases than you do. Some of us even know what works best for us.