Why does the micro:bit extension have such limited features? It doesn't allow for audio, or it's microphone. The micro:bit can both read and write to GPIO, however the scratch extension only has an ambiguous:

micro:bit | when pin (0 v) is connected :: #10cb87 hat

This block does not specify what this means. The only way of detecting if a pin is just connected to something is measuring random noise, but I doubt it does that, nor would it work well. The other plausible alternatives are that it can measure current (unlikely) or it has an internal pullup/pulldown resistor and is triggered when the voltage drops to ground or is raised to VCC.

I am asking:

• Why does the micro:bit extension have such limited features,
  
• What does this when pin (0) is connected block measure, and
  
• Is scratch going to add to this micro:bit extension in the future?