Hrm, another point that people are missing is that frequently conference organisers have no idea what the technical talk will be about until the few weeks befor

Hrm, another point that people are missing is that frequently conference organisers have no idea what the technical talk will be about until the few weeks before the conference. Sometimes those talks even change topics during the conference themselves. It's par for the course for a seminar topic to not be set before the speaker is even invited. How are organisers supposed to sort out the technical merits of a talk where the speaker frequently hasn't written it themselves yet?