Another point is it is the only multi chassis class on the way to F1 except F3 which is nearly all Dallara anyway. This helps designers engineers and drivers.
You won't learn as much about setting a car up jumping into a Renault or BMW that has been the same for ex number of years, as the team will know exactly how to set it up. If FF takes off again there will be new cars every year from about 4 manufactures. Look at the changes in design in the past RF84 to RF85 or RF89 to RF90 or the Swifts and Rays of the early 1990s the last real hayday of National FF.
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