You expounded on the value of knowing how to run a gin. May be wrong, but doubt you have ever even been in one.
The line of thought from the left on the Florida topic is that people were enslaved so they could be taught job skills. If I thought that the case, I am in agreement that is an abhorrent practice.
But looking at the topic, it seems as a result of being enslaved, a practice we all abhor, there were skills learned that benefitted the previously enslaved economically in their new-found freedom. They were not enslaved to teach them necessary job skills when they would be freed. They were enslaved because there was an economic benefit to slave owners and part of that economic benefit was learning certain skills.
There is literally no one I have read or heard on the topic advocating enslavement to teach job skills or defending such a practice if it were In effect.