I thought it was so I could go back 1 year and say, 'I was against this from the beginning and I was quite vocal that if you do this, the result will be the exact mess you're asking me to clean up now.'

Ah, but a record for CYA and “told you so”, that’s pure cynicism. “At least one person paying attention” at least we can pretend the intent was to pair some potential usefulness with our cynicism.

Also, ensure that if the final decition was to paint the the bike shed green, everyone agree it was the final decitions. (In long discusions, sometimes people misunderstand which was the final decition.)

If they misunderstood they will still disagree so the meeting notes will trigger another mail chain and, you guessed right, another meeting.