Not strictly true in this case. Apple added a lot of additional functionality to the airpod pros over time. The tuning is hidden under the accessibility settings, but it’s there.

They have added some things to the airpods over software updates. But I assume they are pretty limited if they are already pushing the hardware to the absolute limit on release. A lot of the stuff they push over updates seem to be things they already planned to have but perhaps didn't have the firmware polished enough yet.