Here is the main point of all this. Yes the original formula paint had
texture in it, but most people today cannot shoot it the way the factory did.
You can say over the years it was washed off and worn smoother BUT, after seeing a 1700 mile A12 and this 5000 mile A12 I can tell you 90% of todays restorations are WAY TOO ROUGH. And neither of those cars were ever on the road enough to change the finish. Both have been used for documentation and reference as some of the best original examples left today.
It should look like 1500 grit NOT 100 grit.