And to build on my above note - I do think Marriott did really well by "us" (loyal SPG types) prior to 8/18. The 3:1 point conversion wasn't guaranteed, so that worked out well. They kept a lot of the SPG program touches too (SNAs, Ambassador level, in theory Your24, etc.) So some of that was a pleasant surprise - could have been a lot worse.
However - the decline of customer service and ongoing atrocity of their IT post-8/18/18 are simply inexcusable.