This is actually how I do things when working on remote machines. I have far too many monitors, so dedicating on of them to a handful of btop/nvtop terminals works pretty well.
I admit that it’s a less than perfect setup though, and a single program which could handle the remote connections internally and display an aggregate would be nice.
Personally, I have ditched kvms and physical machines in favour of virtual machines everywhere. One set of input devices, three monitors, seamless control of each machine.
I would argue that the modern smartphone is different, but by no means better. Between the locked down operating systems and the lack of a physical keyboard they are great for consuming media through approved channels, but basically useless if you want to get any work done with them.
smartmontools has some good functionality for interfacing with SMART via usb bridges that do not provide native functionality.