Some of you here are being stubborn for tradition. This isn’t just “another thing for the ref to screw up”, these calls would be made either way, for a yellow or red. If anything, this option could lessen the effects of a bad red card call. The yellow/red card system is way too rigid and doesn’t allow for proper game management from the ref, as since the gap between the effects of yellow and red are so large, players will absolutely push what they will get away with. Introduce these sin bins, and we could even see time-wasting reduce.