Its only a bit overkill if you drive like a pansy!
Trust me, the spec of Miss Scoobys car coupled with the way she drives it she needs all the brakes she can get! It also limits the strain on the step-of and center diff on track days, etc.
Loads of scoobys have 4 pots on the rear but agree its more of a competition thing, but then lifes a competition and its the person with the most bling that wins