On the other hand, since all the design files are available, anyone can design an upgraded motherboard for this machine and keep all the other parts out of the landfill.
https://www.clockworkpi.com/home-uconsole is another great example of a machine I've seen people mod into all manner of special-purpose device that wouldn't work as well with a used business laptop.
I agree, it's probably a better idea to stick to something that was sold in high volume - if only for replacement parts down the road. If one really needs low power, an older M series Mac would also suit the bill (sacrificing many of the other benefits of course).