I think the most unjustified changes that were announced concerned the treatment of rollover MQMs.
In the world of rollover that had existed for nearly 15 years, one has been indifferent, once earning the highest status they can, between continuing flying thereafter in one year vs. postponing that travel to the following year.
The MQM to MQD conversion rate nearly eliminates the value of MQMs. If MQMs still existed in 2024, I would start the year ~80% of the way to Platinum. At the announced MQM to MQD conversion rate, I would start the year ~17% of the way.
As a result, had I known these changes would occur, I would have been better off postponing over half my 2023 travel into 2024, and not bothering with over half of my credit card spend.

There are two ways that they could have not destroyed rollover MQMs:
- Announce now that 2024 will operate under the old rules, but no MQM could be rolled over into 2025
- Make the MQM to EQD conversion such that one would earn the same percentage progress towards next year's status requirements via MQDs as they would have under MQMs