Re and TTe are the same as a 2016 enduro large and a 2013 mega TR large given or take 10mm either way. So I think reach is on the money.
most peoples L is an 18.5. I think what YT have done is pretty standard
I agree L is the new normal, I used to always be a medium and now I take a large in bikes, weird marketing bull.
My thoughts on the Jeffsy are shut up and take my money, it looks great.