So, panning with a fast moving subject, long lens, challenging autofocus, sounds like a niche skillset.
I'm pretty sure many people take a while to tune into the parameters to get the results they want.
"I realized that 1/3200 sec was not enough for these captures"Perhaps our resident sports car specialist MFloyd will have some views on this?
Meanwhile, here's something taken on an M/F lens at a much slower shutter speed
I had the advantage that I could pre-focus on the track before the bikes appeared.
Also the distance from subject was not changing as much (but remember, no A/F)
The bike was probably still going over 100mph, decelerating towards the first turn at the UK Silverstone track
Pentax MX Kodachrome 300mm f4 M* lens, 1984 (when I had steady hands and could operate the gear without having to look). This is a crop.