Do not forget many of the rally cars were/are factory rally specials with highly paid factory drivers.
Parnelli Jones won the Baja in a factory backed car; the cars that ran the mostly defunct African rally , which was the Indy 500 of rallying, were there with factory backing.
If you have time look up the Targa Florio, it was tech. a road race but it ran on paved and dirt roads, literally roads.
That it survived as long as it did was amazing and a testimony to the cajones of cars and driver fifty years ago.
I admit the chances the drivers, and spectators, took in the old super hot factory cars was fantastic.
As far as that goes, PIkes Peak is a timed rally and since after over 100 years and motorcycle rider died there last year, they will no longer allow motorcycles to run there.
The Isle of Man, road race,is really a timed rally on paved roads, a year where no one dies there, is a very, very good year; racing in the U.S. is turning into safety bumper cars.
As a top driver said a long time ago, I wish I remembered who, the gas pedal goes both ways.
In the U.S. international style rallying never took hold because of too many lawyers, and too little money to support it.