Sometimes you have a big and important project and you cannot afford to allow for mistakes where members accidentally mess something up. In times like these, it would be nice to lock things down.
At first, I thought this could be solved with automation but on second thought, I believe this should be part of the Permission setting on the actually board, as a sub setting to the activated "Members can add and edit cards", like this:
  • Only for cards the member has been assigned to [checkbox]