I was sent an email survey from the DNR a couple weeks ago asking for input on WMA fields with this change. They gave two options. Keep it the way it has been and shoot from noon to dusk, or daylight to noon. I have no idea why they would stop at noon. If you are going to open it at daylight then I think it should be all day.
I voted to keep it like it has been as I think evenings are best early season anyway.