Steve,

You made several false or strange assumptions.

A spin boat DOES NOT always sail deeper than a non-spin boat.
Some non-spin boats have proportionately large jibs and sail very deep.
Modern spins are designed to be sailed very high.

The current Rules make no assumtions about the type or number of sails that boats are using.
On the contrary, the Rules are designed to allow different types of boats to race each other safely.

The rules under which almost everyone races are the ISAF, Racing Rules of Sailing.
They are for and about boats RACING.
The ISAF makes no rules and has no juridiction whatsoever over non-racing boats(see COLREGS).

Most accidents have nothing to do with blind spots.
They are usually caused by people who don't make the effort to look where they are going.

You are going to keep beating this blind spot "dead horse" ad infinitum aren't you?
LET IT GO!! It is not, and never will be a legitimate excuse for hitting another boat.
Everyone else has also explained this to you, when are you going to get it?

You asked for "nice and friendly" and then you insult me because you don't understand my comments?
Right-of-way sitituations occur all over the course involving even the best skippers.
The good skippers see the potential situation coming and are prepared if some novice
is barreling across the course with no regard for his fellow sailors.
A poor skipper blasts along without looking well ahead of his boat and has to make a crash tack, or just a crash,
because he drove his boat into a situation that was too difficult for his skill level.
In simple terms, a good skipper plans, a poor skipper makes excuses.

By the way, I have averaged racing in 10-12 regattas per year, avg. four races per, in small lakes, big lakes,
bays and the ocean, for the past ten years.
I regularly race in mixed fleets with uni-rigs, sloops and spin boats, from 14 to 20 foot.
Where I race, if you don't learn how to identify the "poor skippers", you will pay the price one day.