They actually brought back ground effect this year with the newest regulation change. The argument was that if cars relied on ground effect for downforce and less on front and rear wings, cars could have an easier time following the car ahead because the turbulent air becomes less of a factor (due to ground effect not being as susceptible as the front wing to turbulent air) and being able to follow more closely makes for better racing. As a fan, I certainly can't complain. The commentators certainly never miss a chance to remind us how good the new regulations are.