10t cog is not that efficient. Quadratish, not praktish, not good.
LOL
But you're not wrong. I have a 10t and it always horrifies me when I turn it on the stand and FEEL what seems like grinding in the drivetrain. Eeeek yuk. But, on the road/trail, it's really not noticeable and having 10% more range is nice when you need it. But honestly, I have few rides where I spend a lot of time in the 10t