Colin Chapman would've disagreed...and the Lotus 72 demonstrated why.
It immediately showed an improvement of 20km/h top speed over the Lotus 49 - with the same engine.
A modern F1 car creates sufficient downforce to be able to drive on the roof of a tunnel at 130km/h. That's hardly "useless".
Actually, I don't understand what your point is, at all...
Well........I can't see any value in driving upside down in an F1 car ....

And that old myth has been around since the days of 'Ground Effect', during which time a Porsche 962C and a contemporary NASCAR (mid to late '80s IIRC) ran several comparative laps at one of the big ovals.
The NASCAR was considerably faster than the 962, as no ground effects won out over the Porsche that was 'sucking' itself to the track surface, of course, at Le Mans (for example) it would have been the opposite.
Aerodynamic detailing of the current 'Formula 1 Cars' costs more in time and money than engineering.
Wind tunnels of a suitable size and properly equipped are affordable by the major teams, the minnows end up buying obsolete equipment or renting time in generally unsuitable facilities, Lotus in 1988 were crippled by doing just that!
Chunky actually designed the 72 as a vehicle with greater mechanical grip and smaller frontal area than the 49, and FWIW, Lotus ALWAYS received special 'development' engines from Cosworth, which practice continued right up to the early 80s.
The aerodynamics were really not a big part of the initial 72 'package', as with most cars of the time they were only useful in trimming the car out, and obviously Chunky was happy enough to remove wings completely in an effort to gain extra speed ...... Rindt paid the price for that experiment!!
I know we can't go back as Ed has pointed out, but the very best open wheel racing today takes place in a series where wings are no allowed, Formula Ford.
I'll get 'orf me soapbox now!
:ernae: