Yes, but that's what happens when you have an implicitly colluding banking cartel... I was just trying to demonstrate the logic. Using a 3m t-bill vs a 2y bond works just as well.If my understanding of overnight deposits is correct, well it still seems to be very low (in the 0.05% range from a few banks I looked at). Assuming a parallel rise in yields, a 3 month t-bill should return 0.9%, more than most deposits to my knowledge.
Point is that the Fed hikes affect the short rate, which is the anchor for the return you get from any other instrument. Assuming you were indifferent and the expected return of a given instrument relative to the short rate hasn't changed, there's probably no reason to get too excited.