Ohh you just kpened up a big can of worms.
For the record Audi when asked about a possible F1 jump similar to BMWs in the early 2000s from le mans racing released a statement where they said something along the lines of...
"We think that endurance racing is a greater engineering challenge than F1 and we want to stay in the series thats at the forefront of technology"
And ive caught a lot of flack over the years because I'm inclined to agree with them.
Sportscar racing is just better racing too.