I voted against it because while it is a good thing for the SoFA to have a little flexibility surrounding the opening time, I believe it is in the interests of voters to have a better sense of the times for the election ahead of time.
If (read: when) this passes I encourage the Senate to write a bill requiring the SoFA to notify voters when he intends to open the voting thread. I fully suspect Ernest will do this as he has been extremely communicative about what's going on; however, we can't always write laws that rely on future cabinet members to be as good as the ones in office when the law is written.
Then you have completely ignored the rebuttal of this argument that I made
here.
It was always intended that the Amendment be backed up with supplementary legislation (hence the explicit commitment that the Senate could restrict and regulate the opening time), its just that using the Constitution to define every detail is not always wise.