The problem with the data out there is it's time only... You wouldn't know what's wrong with certain cars, or which cars didn't do a full tilt build, and the biggest one, the driver talent. The data has little control.
Besides having a good system of point assignment, and how to evaluate and change that point assignment, the workload the system would need is crazy huge. Just look at the index for Stock Classing. You'd have to figure out the base points for all of those cars, figure out which cars are too slow for the class so that they have a smaller starting point, etc.
Then you'd have to figure out how to manage the mechanic of engine mods.
A car has 170whp stock. individually, all these parts are dyno evaluated to give; Cat-back exhaust (+5hp), Headers (+9hp), pulleys (+6hp), ECU chip (+13hp), intake (+4hp), Race Cat (+2hp). But lo and behold all together it doesn't net the sum of the parts does not get +39hp to get the car to 209 hp. Nope, the sum of the parts gets it to 196hp.
Money and testing will always be a part of some racers process. So when you put a points value on certain mods, let's just say a point per HP alone, but the next class is less than 39 points away, some guys will have the time, resources and money to optimize those mods to stay under the threshold and others won't. Some guy will find the perfect combination to spend only 23 points to get actual combined 20whp and stay in the lower class, some other guy will spend 26 points, only get 14 whp, get bumped to the next class, then rant and rave about having less power than the guy who didn't get bumped, so why did he get bumped.
More to the point, running a region has so many variables already, including lamenting over the state of the rules, the classing, Street Tires, the .975 modifier... I think the points system would have a negative effect on the regions ability to manage a day-of, because there are 7 broad categories to present and that's it. Each has their allowances. The points system is going to be a specific to your car, and a specific to every one of your mods you have, and a specific to every mod you haven't done to your car. The specific will trigger more of a response from each competitor. Some will have strong logical positions of conflict. Some will just believe they are being wronged with no actual data or logic to back it up (a 19 yr old kid couldn't possibly beat me, etc.). You won't have controls.
After a certain point, you'll have to put a value on a suspension type vs. a different suspension type (which is dynamic).
The same mods to an e36 M3 through the present levels of classifications we have won't net the same reduced times as those mods to an RX-8.
From my standpoint, it's too many variables to knock out when we are trying to stay a low-cost, introduction racing. You could try some sort of power/weight thing, but then you'd effectively require dyno time for every competitor, and scales at every event.
BMW doesn't do a national point system, each of their regions kinda do their own thing for autocross. The points system I've seen are still broken, even when you have the control of at least similar cars (mcstrut front, multi-link rears). And being a regional where the decision makers are out in the open, it has even more inertia than the SCCA model out of fear of change. The 135i in stock form is basically in their highest point category, with fully built M3 Road Race cars. That's with an e-diff, body roll to infinity, and skinny front wheels. They tried to "point" out the difference between street tires and race tires etc., it doesn't quite pass the smell test. It can still be fun because its autocross, but it didn't bring more parity even within a single marque.
The points system could work with a TON of modeling, resources, money, time. I don't think from the no resource, just a few guys "thinking" and looking at times that the system could work. What would you use for the difference between 140 UTQG and Hoosiers? A .975 modifier to the points? I think that one is too dynamic to quantify.