And I don't want the car to follow the speed limits as they change, sop I hope Tesla never forces that upon us. As an option? Sure.
Would you be using the "Snap to speed limit (plus offset)" toggle to set TACC?
I'm thinking the logical approach is to make it so the car follows the speed limit as it changes if set using that while not changing the speed if TACC is set to a speed other than the limit+offset.