Not everybody knows how to build a PC or how to install Steam OS on it. Here we also get support from the vendor so we know everything should work fine with the components.

I think it is a great idea! If you dont like it, then there is no downside, just don’t buy it.

I think you are aiming for people that don’t want to learn maintenance work. This means you have to take care of that part.

This means protect the OS from crashing when an app fill up the disk. Security. Upgrade the applications and the OS itself. Perform backup and rollback if something goes wrong. Add/removal off harddisks. Handle hardware failure and inform the user what they need to replace. Migrating to a new server.