It’s ISAF and our own hang ups that are the issue here. We are killing ourselves with this drivel.
The IOC does not place restrictions on what can compete etc. Do you think all the bob sleds, or rowing shells , or even shoes are 1 design.

We are in danger of losing all sailing from the Olympics because it has no viewership and is expensive to produce.

Any properly constructed box rule can limit to some extent the expense. Even in a completely open environment the boat is only a small portion of the cost of a campaign anyway if you want to be competitive.

Either way the boat has to be flashy and we have to get young hot bodies out on the course. (leaves me out but that is not all unfortunately)