Sometime, just once in a blue moon, the rules have a big benefit, often indirectly.
Years ago, when unleaded fuel was being introduced to the UK, hardly any garages sold it. The tax on leaded fuel was increased to put the price the same. That made no difference, as most garages didn’t want to stop selling several grades of leaded fuel (91, 94 and 97 octane, sold as 2 star, 3 star and 4 star) so they had no tank space for unleaded, although few cars used anything other than 97 octane, and the price difference was small.
In a clever move, the government increased the tax on the lower octane fuels, to bring their prices above that of 97 octane. That meant that there was no point in selling the low octane fuels, and very quickly the garages stopped selling low octane fuels and used that tank space for unleaded.
A bit later, catalytic converters started to be required on all cars. There were a lot of complaints that cars with catalytic converters would be slower, thirstier and break down more often. However, for most cars the opposite is true. The catalytic converters are fussy, and if the cars are to pass the emissions tests when a few years old, the air/fuel mix has to be right all the time. That forced the manufactures to get the fuel systems right, giving reliable, economical cars. Not the primary aim of the legislation.
I would like to suggest a new tax. Split air conditioners should pay £100 per unit. I don’t particularly want to pay £100 extra, but a tax would mean that air conditioning units would not be split, so all the refrigerant gas would be in the outside unit. Then water / antifreeze would be used to shift the heat from the room. Such systems are made now, but are rarely used because they are more expensive.
The advantage is that specialist fitting isn’t needed, as only water and antifreeze are moved around the building. Leaks are obvious and it is so much easier to move or reconfigure the systems. Refrigerant leaks are rare, because the gasses are totally contained in the outside unit. It won’t happen, it would be too useful.