Visually, the 2021 car concepts released during the Singapore Grand Prix weekend are very sleek. But it's easy to come up with ideas for how you might want grand prix cars to look, what's a lot more challenging is ensuring the teams produce something that is anything like what you want.
Looking at the smaller details, F1 has gone to reasonable lengths to try to understand and correct the problems the current aero flicks and vanes cause to the airflow that is being used by a following car.
It seems the major input is from a stylist rather than an aerodynamicist. But as long as the main downforce producing components - the front wing, underfloor and rear wing - are conceived to allow them to produce their forces as standalone parts as opposed to the current situation where their performance is heavily influenced by vortices produced by other flicks and vanes, then the cars will be more aerodynamically consistent.