We've been over this. A 12" size limit would be pointless in Tennessee because the growth rate is too slow. In most places in Tennessee, it takes as long (or longer) for a crappie to reach 10" as it does for a Mississippi crappie to grow to 12". A lot of our crappie die of natural causes (not harvest) without ever growing to 12". Putting a 12" size limit on them won't work if they're simply not growing that big.
Look at Tellico. That lake has one of the slowest growth rates in the state. Lots of small crappie but they don't live long enough to grow to 10" at their growth rate. Putting a 10" size limit on that lake hasn't increased the number of keepers because it takes 5 years for a Tellico crappie to grow to 10" and their average life expectancy is closer to 4 years. A 10" limit there gives you plenty of 8-9" throwbacks but not more keepers.
If they grew fast and lived forever we could put a 20" size limit on them and catch giant crappie all day long, but that's not how it works.
also tell them you don't buy that crap that our fish won't grow fast enough
Do you have any science to back that up? You can "not buy" it all day long, but TWRA has years of sampling data that say otherwise.
You might as well call NASA and tell them that you "don't buy that crap" about the moon being make of rocks, because you believe it is made of cheese.