Is it a throwback...
Actually you'll find that if you go back far enough there were no announcements (too noisy) so the captain or FO passed a piece of paper around the cabin.
This has all been Ppruned about before. Some people prefer silence; some would prefer a running commentary. Can't please everyone.
I have also been on trains with announcements. Once in the UK the driver forgot to turn off the mike after one and we enjoyed driver gossip for the rest of the journey.