All good points but:
The mosquito is a 2 distinct material boat.
As far as I can see in the rules a titanium alloy aluminium honeycomb construction would be legal, as would concrete hulls (for the more aggressive sailor!) or injection moulded polyurethane (for a maintenance-free though rather floppy Mosquito!). There doesn't seem to be any material specified for building Mosquitoes.
The newer fiberglass boats don’t appear to have strength issues so what is the purpose of making the gunwale stronger?
The purpose is to make the boats easier to build - making the finishing of the gunwales easier and also allowing a builder who wants to build a new mould the option of making a two-piece mould. This seems to be a popular choice with some builders. The extra strength gained by a less sharp corner is a happy bonus.
we change a rule that intern changes the shape of the hull we date all existing boats
Well if we were talking about a 100mm radius I would agree, but 10mm of shaping is not much more than has already appeared on a few Mosquitoes over the years which have gone by completely unnoticed until measurement time. I really don't think anyone would notice the difference.
he was impressed that the mosquito has not gone down the road of high tech material
That might be his perception but Mosquitoes have been built using foam, kevlar and carbon for almost as long as it's been available. Timber boats can still be competitive due to the class minimum weight and shape/size. Some good choices were made way back when these things were set. That's why Mosquitoes rock! Doesn't mean small refinements can't still be made though.
In most cases it is still cheaper to build a timber boat then buy a glass one. By changing this rule we will be making the glass boat a fraction cheaper and the timber boats less attractive due to them being of the “older” design. Therefore we will be encouraging the more expensive route rather than encouraging the cheaper one!
So making a glass boat slightly cheaper to build will encourage someone who was thinking of building a timber boat to maybe spend a bit more and get a glass/foam boat? They have the same choices but one of them is less expensive. Sounds like a good thing to me
Wow this got really long!