Hmmph, well another data point is that I love the ICYMI feature and use it every day. My feed is too big to ever read every tweet and get to the bottom, so it works for me.
I am glad that it is useful for you. It bugs me though that Twitter is trying to force everyone to use their service the same way. I want to use Twitter more like an RSS reader to catch interesting news stories and blog posts. The fact that they are actively discouraging using their platform like this is infuriating.