On a sprint weekend, the planks undergo 19 more laps of wear than at a typical event. In this case that’s almost 65 more miles of racing on the same plank. Holding the ”randomly selected cars” to the same floor allowance as if it was a standard race weekend but then NOT checking all the teams when you have a 50% failure rate is just plain wrong. Either have a different allowance on the sprint weekend, check ALL the cars or don’t check at all.
Just a nitpick: it's not always 19 more laps. It's the fewest amount of laps that puts the sprint race over 100km (about 62 miles). At COTA, that's 19 laps. Next time at Interlagos, it's 24.