I was under the impression that the $10k cap is for SALT and mortgage interest is separate? The mortgage interest deduction was reduced, interest on new loans is only deductable for the first $750k of debt, instead of $1M, and mortgage rates were really low in 2017; capped SALT + a relatively low interest rate on $750k might not combine to more than the standard deduction if you're married filing jointly. Certainly on my ~ $350k mortgage @ 3.15%, I stopped itemizing after the tax changes.