I would ask you to put forward an intelligent and logical explanation of why the fact that rules change is a valid reason to ignore them, but I fear that that would be totally beyond your abilities.
There are instances where the reason for the change in the rules was not intended to improve safety, (*) but was to make compliance easier and / or less expensive. Ignoring these changes does not create a safety issue though some jobsworths and narrow minded people would insist on compliance with the new rules even if it meant safety was reduced. Rules that eliminate the application of common sense can create more hazards than the application of common sense would have created.
(*) harmonising colours did nothing to improve safety and may have created more hazards due to the confusion over which colour to use. Red Yellow Blue was obvious. Live Switched Neutral Brown Grey Black is not so obvious.
