“They did so without any announcement or fanfare.”
A BIOS update to AGESA 1.2.0.2a turned off Zen 4’s 144-entry loop buffer, and only the performance counters show it. SPEC CPU2017 moved less than 1%, but Cyberpunk 2077 lost 5% on the non-VCache die. AMD documented the feature in one line and removed it without a word. You own whatever the latest firmware says you bought.