All good and well but my Shimano 10 speed 11-23 cassette has 11-12-13-14-15-16-17-19-21-23
I don't see an 11 or 12 speed 11-23 cassette being all that much nicer.
I never need a lower gear than 39/23 ... I simply HTFU and go up 20% cobblestone hills in that gear.