My Wilier road bike is scratch-free apart from one end of a Speedplay pedal, that you can't really see easily, bought in July 2019 it has done 7605 km (4726 mi) - a lot in pelotons and fast group rides. It is also unpainted as part of the weight reduction aspect of it and so more resilient to marks and small stones just bounce off leaving no scratch. The pedal scratch was from a low speed roundabout crash where sand was on the road: skewers, handlebar tape and pedal took all the impact. I replaced the handlebar tape and skewers.
My 29er MTB bought in June 2019 is very much scratched - all over! That's done 5251 km (3263 mi) of off-roading, mostly on harsh, rocky terrain including racing and a few crashes.
I've done 2112 km (1312 mi) on my new 2020 Trek Madone over the last 2 months, zero scratches, harder to avoid being painted red of course and I clean it - as the other bikes - after every ride and hope to not see scratches albeit inevitable eventually.