Then it'd be very purposeful, the idea of this kind of patch would be that someone Googling random older PG answers to fix a random issue wouldn't be tempted to

Then it'd be very purposeful, the idea of this kind of patch would be that someone Googling random older PG answers to fix a random issue wouldn't be tempted to just issue an ALTER command, think the issue is fixed and then find out after a restart/rebuild that the fix is not there any more. This not a security patch but more of a safeguard against hapless idiots manhandling themselves without resistance in an unsupported case.