Well, it matters alot, and the ratio was chose in concert with the others, to render the greatest amount of cars possible to be competitive.
Odd since most of the popular older cars have ratios in the 19-21 range.
Changing it now might mean that many cars will need to add or subtract ballast.
No. Since most cars are NOT at the designated ITB ratio, a heap load of cars are going to lose weight and a few will get weight. Finally, some outliers are going to move to new classes.
Since IT didn't come to the party based on bogus hp ratings, it shouldn't suffer.
Everyone at the same ratio. If you can't make it, you either are uncompetitive or accept getting dropped down to a slower class. Dual classify the folks in the Nash Rambler who want to stay in ITB instead of going to ITC.