You missed my point, actually. I wasn't suggesting a command-line shell that has autocomplete should run on the device. I was saying that you usually don't need

You missed my point, actually. I wasn't suggesting a command-line shell that has autocomplete should run on the device. I was saying that you usually don't need any developer tools on the device at all. All you need is a way to upload firmware. All the developer tools can run on the laptop. You can run VSCode and work with tiny devices. This means that making developer tools small and simple to run on tiny devices has little point anymore, and languages don't need to be small and simple either.