If it came bundled around a bunch of DIY guides explaining the hows and the whys, it’d be far more appealling
Interesting, so if you got hardware and it came with guides, what kind of guides would you want? I would assume something layered. At the top is just "I want to install these 5 apps and use them, I don't care how it works" and in the middle is "I'm ready to SSH into the router and create some VLANs for fun" at the bottom is something like "I want to flash my own firmware with appropriate certificates for secure boot and my own root chain of trust on the server hardware".
That's certainly an option. I think of dedicated hardware as working for several different people, some of which care a great deal about not using a VPS provider because they don't trust them with their data, or don't trust them to be around for a long time, or don't trust them not to raise the prices.
I'm inclined to agree, but I've been doing hardware for a long time as a hobbyist and I sometimes forget how far I've come. It sounds like you might be somewhat like me in that regard. I'm often surprised when people see assembling system parts and flashing an OS as a complex, inscrutable task.
What do you see as the hard part of maintenance? Scheduling time to do it? Unexpected errors or failures?