When it comes to ATT&CK I have personally seen people go 50/50 on it, with most support coming from those in large enterprises. It's a pretty good resource for pentesting or red-team engagements, but probably could use less evangelizing.
I spent from 2005 until ~last year running pentest engagements, for what it's worth.
I definitely haven't. Is it something you reference? Some of the technical aspects seem as fine as anything you could google, but the whole kill-chain thing always seemed a little overblown. I agree with your comment about it not benefiting practitioners as much.