Better cassette spacing for aging rider
As I approach my 67th birthday, I find that my average speed for typical rides is not what it used to be. Related to that, I also find that I use the smaller cassette sprockets less frequently. Actually I never use the 11T and 12T sprockets at all. I can't push those gears on flat roads, and if I'm on a downhill I don't feel the need to keep pedaling above 35 mph.
So this leads to my question: Why don't manufacturers produce cassettes without 11T and 12T? My ideal cassette -- matched with my 50-34 crankset on an 11-speed (Shimano) bike -- would be a 13-30T (13, 14, 15, 16, 17, 19, 21, 23, 25, 27, 30).
My internet searches tell me these cassettes don't exist, but maybe I've missed something. Your thoughts?