Ah yes. Brings back memories of Sunday doubleheaders. And the occasional twi-night doubleheader. Nowadays I think the only doubleheaders happen when making up a rained out game.
Baseball has changed but not all changes have been for the better. Or maybe I’m too nostalgic
Later, they became almost a necessity for a 154-game schedule because teams traveled by between cities and needed a lot of off-days in their schedule to get to places like Detroit, Chicago and St. Louis. That all changed with air travel, even with teams spread all over the country.
P.S. — The Boston Braves played 38 doubleheaders in 1931, which I believe is the all-time record for one season. That means they played 76 games in doubleheaders that year, which is almost half of their 154-game schedule!