The chronic problem here is a lack of proper education in advance of these kinds of changes.
We’ve gone from 3 hour brackets commencing at the start of the validity period, to 3 hour brackets spanning the 90 minutes before and after each 3 hour period commencing at the start of the validity period (that method was always doomed to failure from a comprehension and compliance perspective, because it’s counter-intuitive), back to 3 hour brackets commencing at the start of the validity period.
But we’ve also gone from interpolation: ‘bad’, to interpolation: ‘good’.
Lucky that keeping up with these changes has zero implications for safety…..