In my opinion - they still aren't. There has also been an increase in injuries since the advent of 'Lay Down' Engines too.
The Tracks are basically the same size and shape that they were back in the 1920s. The Bikes nowadays are totally different, and compared to the Bikes in those days a lot faster. You don't expect a 'Typhoon' Fighter to take off from a grass field like SE5As, Sopwith Camels, Spitfires and Hurricanes did, do you? Yet that is precisely what you are asking these new Bikes to do on Tracks that have not changed in some cases for 90 years.
It just doesn't make sense.
To me, it is little wonder that there are not more serious accidents.