I recently posed a question to the support team. Here’s the link to that original post on the community page:
My understanding is that every step in a section/group must have the same condition for it to apply to those steps. Additionally, the top-level section/group structure itself must also have the condition.
I think, and it seems Morten agreed with me during the conversation, that it would be much simpler and more intuitive for the user if there was either an option that allowed you to apply the same condition to all steps in that section/group OR if creating a condition for that section/group automatically applies it without user intervention.