A lot of this has to do with segmenting the market into high-end and low-end products.

When they were the underdog to Intel, they gave away lots of premium features to beat Intel.

Since they got more popular, AMD has been taking away features, or not upgrading old tech, from their desktop/gaming CPUs: Their DDR5 interface is gimped, being slower than Intel now, and still limited to dual channel. Their chipset link is still PCIe 4x4 the same as two generations ago.

If you want these features now, you need a server product.

None of that is a good rationale for patching the firmware to retroactively remove things from devices that were sold years ago. It's an abuse of a mechanism that's ostensibly meant for security fixes and maybe perf improvements, which is a dangerous game because it incentivizes people to just not update the firmware at all, which is a worse scenario for both parties than just resolving to not include the feature in CPUs going forward if it's such a huge loss to include it.