Except it's not 'once' though.

In order for it to be 'once': all hardware must have been, currently be, and always will be: interchangeable. As well as all OS's. That's simply not feasible.

I don't see, how is it relevant in this case. We are talking about writing an integration with an HTTP API (probably) in a high level language (TS/JS, Python, etc). We have already abstracted hardware away.