I work for for an insurance broker and a key part of my job is clients coming to us (and our competitors) with a problem they have and we have a few weeks to put together a report with our proposed solution.
Typically results in a brainstorm, narrow it down to 5 ideas, 2 weeks of actuarial analysis on those, and then a 50 slide PowerPoint to explain those 5 ideas and our overall recommendation for our pitch.
One guy never joins any of the calls throughout the project because "he is too busy" but consistently finds time at 4pm on the deadline day to start raising questions and concerns about our recommendation (cc'd to everyone he can think of obviously!)
There's obviously nothing that can be done at this stage so I have to send the report as it is and instead of the happy feeling you get after finishing three weeks hard work I'm left feeling a bit shit as the project lead, and he looks great for spotting something nobody else had picked up on.
AIBU? I think it is a really horrible thing to do to people on the deadline day of a major piece of work.