Are you saying you never run the code you work on at all? You can't e.g. step through it in a debugger? For testing even the simplest thing you have to submit y

Are you saying you never run the code you work on at all? You can't e.g. step through it in a debugger? For testing even the simplest thing you have to submit your code to some external system? If that's what you mean then indeed I think it's pretty unusual. I've worked on stuff that's not at all web or desktop related (e.g. Materialize, hosted cloud data warehouse software) and still, we had ways of running it locally; otherwise most people would have found it impossible to develop.