Like the automobile industry models change every year, the boat builders are free to do whatever they want in the way of modifications,
whether it is in the name of development, cost savings, safety, or sales.

Can vestal one design be maintained forever? (Even the Laser has changed it's rigging, oh my deity)
Over the years we have all seen product innovation (PI) at what cost?

PI continues to sell new boats, or new sails. Again, no one complains when sail shape changes, and chalk it up to maintenance?
If the perfect boat & sails could be built to a level where they are maintence free, NO fibreglass fatigue, no rigging revisions,
no one would need to rotate boats, and the manufacturers would SINK?

The price of keeping the manufactures afloat is PAID by the sailors sacrificing virginal one design or formula?
Product innovation is what keeps the manufacturer at SEA?
If there is NO incentive to buy a new boat/sail/innovation how are the manufactures going to stay afloat?

Your vestal one design/formula throughout the lifespan of a boat (or sails) is a MYTH.
Boats (& sails) get a little better every year, and after racing a year or two requires new. The cost of new set of sails on some boats can justify the cost of buying a new boat and supporting the manufacturer.
The price can be to high to play for some..... the builders will make a buck$ via market/product innovation resolving your issues?