I was an early adopter of HD Radio. Despite its many detractors, the ability of adding new streams on FM has its potential, though it's not yet realized.
AM HD is another matter entirely. It doesn't work well where deployed, at night it's useless (assuming with tight, narrow-banded patterns it works at all), and it requires compromise to the analog stream. Plus, there is an argument that it violates international treaties when the overly-wide signals impinge upon clear channels for other countries. In short, AM HD is a total disaster.
So, no. I ain't missing it.
As of yesterday, though, WDIA was still lit up in HD.
DE