I think at the time the regulations were thought of we had good engineering back in the day with spring guns, ok they were around 9 to 10 ftlbs, which for most of us Spring fans is more than suitable, we all managed with this level of power and never thought of anything else,,,,did we.
We eventually came to the 1980's and all of a sudden we went FAC mad, how many Fac owners were around before 1980 ?
In reality all we need for most of our purposes are 10 - 11.5 ftlbs, and not any more. If we never had Chrono's then we would never know any better would we ?
Now we have even better knowledge and better engineering with some modern PCP's it shows that the law once made was what was available at the time and not what may be a future invention.
I do think we could do with more liberal power level laws relating mainly to PCP's that can be shot easily at higher levels than the standard tuned spring rifles.
Nice things happen to nice people.