Because as soon as deer season opens it is then illegal to coyote hunt with anything other than what is legal for deer.
So you either have to use a bow, or a muzzleloader or rifle when they come in season, but you also have to abide by the blaze orange laws as well.
I love to deer hunt as much as anyone but I would be against extending deer season any farther into the year.
Open it Sept 1 like KY does.
For the sake of an argument the coyote hunters get to hunt year round.