I have this vague memory of the 4K nightmare Lunch and Learn.
Jeff B. was saying that the new spec included a 'accumulated errors' piece that would possibly make a working but marginal install stop working with HDCP 2.2.
Jack Rainey - Full disclosure...reformed integrator, now mid-Atlantic manufacturers rep for: Integra, Paradigm, Anthem, Parasound, Atlona, LG TV's and Metra Home Theater...among others