It is widely accepted that you fly 3°/sec. On bigger aircraft and during OEI, it is slightly lower.
99% of the jets of 737-800 size and larger I watch never go close during liftoff. 5 seconds from 0° to 15° ish? It just doesn't happen. In my little MD machine, ours is recommended at 2.5° per second, and if done at that rate, the rotation feels positively horrible. The only thing that saves us from scraping the rear end is...we don't have one.
I also heard from old school DC-9/MD-80 pilots that you should rotate fast, because if you don't get your climb attitude fast, you will not climb.
I suspect only because of the very inefficient wing. 20° nose up with a flight path of 12°. Looks impressive though.