That is probably due to the legal department and the engineering department trying to do some major "CYA." I get what you are saying as well and have no intention myself of surfing the comp so I don't really have a dog in this fight.
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Of course they can't, because that would mean they don't sell new boats with the new technology. It's the idea that why buy a new boat when you could just retrofit your old one...
They didn't come up with the design to retrofit old boats, they came up with it to help sell their new boats. Look at the new Tige with the Convex VX. All this new technology that's coming out is revolutionizing surfing. Every manufacture has to come up with something to stay ahead of the game...
Remember back in the day when towers couldn't be retrofitted to older boats because the hull was too weak? ;)
This is the exact reason till aftermarket catches up.