I'm glad this post is here, because specifically the question of what this means for teams using Lego Mindstorms is something we have discussed in regards to adopting the 2020 rules for the Austrian Open
For one I really appreciate the introduction of a handle and switch to all disciplines!
And especially on LEGO Mindstorms it can in fact be sometimes hard for a referee to judge if someone is just hastily fumbling with the buttons, because they are stressed, or trying to cheat and switch programs.
One the other hand I'm skeptical about what this means for the usually younger and less experienced teams that are using the mindstorms platform.
In general they'll need to spend more effort than probably reasonable to not give up a sensor port just to add a switch.
Given that the rules are already a step harder with the additions like potentially continuing the maze after the evacuation zone, I personally would prefer allowing the mindstorms platform buttons, maybe with an express rule about placing the brick in a way so that they are easily visible.
Generally for the sake of our referees it would be great to have the decision clearly stated in the final rules.
Regardless of what decision is made in regards to (dis)allowing the mindstorms buttons as an on/off switch.
Thanks in advance.
Referee & Referee Instructor - RCJ Austrian Open