[Dylan16807]

> I/O is covered by Turing completeness.

Not really. A plain turing machine only has one input and one output over the lifetime of the execution.

> certainly any TC system has the capacity to keep track of time if the pieces are manipulated at a constant rate.

Only if the turing-equivalent machine is iterating at a specific rate and can pause. Lots of these systems run through the entire machine in a single shot and can't manage timing.