One other stealthy part of this devaluation: room types that were part of the Diamond Standard Award category are now gone.
Prior to March 1, I held a reservation for 2 nights at a Homewood Suites in a 1-bedroom suite. It was listed as "DIA STANDARD AWARD", 60,000 points per night.
Today, I changed that particular award from 2 nights to 5 nights. The 1-bedroom suite is still available, but is 106,000 points per night. The Studio Suite is 48,000 points per night (e.g., 5th night free).
Not a huge complaint for this particular award, as the square footage of studio vs. 1-bedroom at Homewoods isn't really worth losing sleep over. But it's disappointing to see that go: there have been many cases in the past where I've booked the "DIA" room, one category above a base room, as basic assurance of something like a high floor, good view, etc. I found that helpful in this no-upgrade environment these days...