Semi-freeing the senior slaves and giving them a wage or basically the right to be free and live and work on their own with the skills and health he gave them is obviously the fairy-tale moral thing to do, but since he has been ok with slavery for so long and this would result in a mayor profit loss because of the time it takes to heal and train each slave on top of this eventually resulting in competition for his own businesses (the slaves could work for someone else, start similar business and train competitors) this feels like a real REALLY stupid move, but I guess this is the kind of stuff that is to be expected from a fantasy setting where the MC will not see any sort of realistic consequences as a result from being stupidly naive and kind..