a series of smol VMs/userspace programs that are each single purpose, independent of one another, and serve as opt-in and drop-in replacements for the features of any other shell operating system.
a parasitic set of programs forming what vaguely represents an OS that leverages the host to communicate with arbitrary metal and simplify the process of customization and maintenance.
rather than a one-size-fits-all VM capable of anything, a number of VMs with various hardware limitations and capabilities that target a specific problem space.
(hypothetically, needs further consideration:) an 8-bit VM for processing text, a 32-bit VM for processing images, and a 64-bit VM for scientific audio analysis. The computer the user assembles from these is only as complicated as their problem space.