Yes, this is good language to build on! Electricity is a fundamental force and effectively a “meta” source of energy (not low-entropy, which has to do with information-ness of an entity). Similarly, computers are Metamedia (this is straight from Alan Kay), in that it can simulate any other media. Much like electricity, computers don’t exist in nature either. They can intermediate between humans and digital/cyberspace (even physical space but let’s focus on information systems for now). But we need to form the right intermediation to balance freedoms vs economy vs security (better security actually increases freedom in the aggregate). We are in the infancy of this!
But you still need to make sure that it interfaces with add-ons that cover the remaining 10%
I have no intention of blocking you from running any program but limiting the interface that will force you to jump through a few more hoops, when you want to bring your own code. This is in essence no different than you not being able to connect your mobile phone to the grid directly and having to use a charger. The benefits of a uniform interface, aka a standard supply and outlet, vastly outweigh the inconvenience of using an adapter (I admit it is annoying sometimes).
I realize though I need to do a better job of explaining the security model and how arbitrary programs will run in it.