In fact, F1 cars have become largely evolutionary over the last two decades. The high nose look with the low-hanging front wing that is a staple today, debuted on the Tyrrell 019 in 1990. Most of the other major aerodynamic features also first appeared in the early 90s, and the changes we've seen since have largely been continuous tweaks based on many hours in the wind tunnel and CFD simulations. The semi-automatic transmissions and other features also debuted around that time. 

The only real powertrain change in the past decade has been the introduction of kinetic energy recovery systems. Crazy new stuff like ground effects, fan cars, and anything more than four wheels is strictly verbotten. It's a shame.