Yes, lets talk about "injuries" and "high stakes":If you have 17! races a year, plus a handfull of practices is quite a difference with the 10 GP's they had than.
And not having to be send to all kinds of promotion events in between.
Most F1 teams (and their insurance companies) don't allow their driver to compete in other series.
The stakes are to high, investments to large, if a driver would get injured (Kubica is good example).
https://en.wikipedia.org/wiki/List_of_Formula_One_fatalities
Anyway... you just enforced what I'm saying: The current F1 format and driving culture is suppressing the real talent from actual drivers (and the same goes with football). I'm not blaming the new folks, but the modern business system that shape the motor sport. You seems like to be praising all this s817.