I get the frustration of the author on grandfathering in mortgages for interest deduction, and you could certainly argue it’s for the benefit of boomers at the expense of millennials, but isn’t it the only sane option? Otherwise the tax bill could effectively be putting people with existing mortgages (not an easy thing to get out of) in a serious bind. It kind of seems a bit unfair.

Though I will admit after writing that out, that it’s probably not really that different than other taxes - if you plan your financial life around a certain tax situation you have to understand it could always change.