Every state is different
And once a law is long standing, it's hard to change it. It gets support from land owners and some hunters alike.
In PA it would add only one day, a mid-week Sunday. And if 12 hunting gun days were only allowed, with some 700,000 hunters, would PA hunters get a Sunday and the loss of the last day -the last Saturday. Some change!!! Sundays in archery season would definitely mean a shorter over-all season.
In the end, it gets down to the state hunting population.