But there the MR2 is not a poor choice for a race car. It has become a poor choice because of the way it is classed. Hell, Minivans could be lapping Porsches if they were classed poorly enough.
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is the ruleset/how the car is classed not a part of the decision making process?

my guess is for many people the answer is "no," which is how we end up in these situations.