Seriously, this is not hard. It’s a software-based system. In addition to the number keys on the keypad, which many panels use for arming modes that don’t have quick keys, we have Alexa and we have an app, which could have an additional button for those too lazy to press xxxx9. As for the indicator lights, they could be configurable or they could simply indicate the state of the motion detectors.
Your suggestion is still not practical when there are residents in the house or other residents who might come home and not know whether the alarm is armed.