Going to have to agree to disagree here. Yes, the shift from award chart to dynamic pricing without notice is the closest parallel. I distinctly remember that one and it burned a bit, especially since it radically uprooted the model. All that said, Delta had been edging to that moment over the years with increasing award chart tiers - folks knew it was coming, although the lack of notice was egregious.

But where the Delta parallel falls short is that it wasn't the pillar of a new marketing campaign. The 2X points on the Edit was a concrete and often-cited benefit and indeed pushed to the credit card blogosphere as a "balancing effect" for the overall change in the redemption scheme.

It would be like Delta doing a massive restructure of their rewards program, advertising a key feature of that program ("Guaranteed 2 cents per point on Delta One and Premium Select redemptions for Diamond medallions") and then changing it less than six months into the Medallion year with no notice.

It's okay to change. It's not great to make a material change with no notice. It's downright terrible to advertise a key feature as part of a new program launch to acquire customers (or retain customers who would have left if not for that benefit) and then change it less than 6 months in without notice or real explanation.