In my opinion the requirement for mainsails that reef to 40% or trisails for inshore racing is a bit silly. In 7 years of Solent racing we've put a reef in during a race once. When it gets windy enough to need 2 reefs, or even more, the racing is cancelled anyway.
A get you home storm jib is all that's really required for cat 4 racing I would think.
The 3rd reef mainsail or trisail is Cat 3. Only a 'heavy weather' jib is required for Cat 4- though I know of at least one class that mandates the carriage of a trisail when racing one design.
I just wondered whether the commitee was acting on feedback or by their own initiative.