Capture the entire meeting, no matter when the "Record" button is pressed
Like with a TV DVR, record all Teams meetings. Delete the recording if the record button is never pressed. This way, if someone forgets to press "record" until part-way through the meeting, the beginning of the meeting is still captured and included.
Chip Linthicum commented
This would likely be perceived as a security or privacy violation at most companies.
This would be a great feature to add, and then control by policy. You may not want this to apply to all users. Being able to hit record after a meeting has started and having it capture everything back to when the meeting started would be very handy.