This happens all the time. People aren't stupid, and often do this. I will seriously answer your question of what happens.
They will be told to shut up, because they haven't listened to the requirements. No one will want to hear it on that call. They will be told it's the wrong audience.
If they push forward, they'll have a conversation with a lot of people after the meeting about how they aren't being helpful.
They'll be told to have a separate meeting with others to validate it. Then in that meeting, those people will rip it to shreds, and indicate that it needs to conform to X Y Z... The PM will then work with you to go through when what actions will be done...
Then they'll schedule new meetings. On and on.. Nothing will change.
I've tried it, and seen it tried. It doesn't work.
You go through the process, or you create even more bullshit red-tape for yourself, and you're seen as a loose cannon no one trusts.
They will be told to shut up, because they haven't listened to the requirements. No one will want to hear it on that call. They will be told it's the wrong audience.
If they push forward, they'll have a conversation with a lot of people after the meeting about how they aren't being helpful.
They'll be told to have a separate meeting with others to validate it. Then in that meeting, those people will rip it to shreds, and indicate that it needs to conform to X Y Z... The PM will then work with you to go through when what actions will be done...
Then they'll schedule new meetings. On and on.. Nothing will change.
I've tried it, and seen it tried. It doesn't work.
You go through the process, or you create even more bullshit red-tape for yourself, and you're seen as a loose cannon no one trusts.