In my opinion – just random thoughts in no particular order:
The whole circus is overly mature and overly regulated.
If striving toward a highly technical advanced series, why so many rules?
The development of the current power-trains has pretty much reached the end.
Even Honda's engines are competitive now.
Why are engines limited to V-6's, more variety would be nice.
Piston engines are noisy dinosaurs, and hybrids are also on the way out.
Any alternate power units and fuels that can be tested- Wankle/hydrogen??
In season testing on Thursday's would be interesting, using a spare car.
Freezing development during the season prevents slower teams from catching up.
Except for the paint schemes and advertising signs, the cars all look identical.
Other than Williams, all of the engineers must be copying each other's plans.
The differences in lap times between cars are often tiny fractions of a second.
The speed similarities are a result of overly strict measurement regulations.
Tires have too much influence on the results of most races.
The rubber marbles ultimately restrict the racing lines to a single lane.
Why not just one tire compound for everyone, a hard type to eliminate marbles?
Mandatory pit stops should be eliminated. Or instead, add a mandatory lunch stop.
Thinking about reducing costs is a waste of time.