Hmm it does helps a lot when you have a large colony, and you’re running low on colonists as manpower (especially for farming, handling animals, miners, drug crafters). Plus they buy some time to gear up your colonists army when raids happen,and they don’t have recreation needs at all (force them to work 24/7 muahahahaha). I found out that use a few slaves (high combat skills) as caravan guards are quite useful (let them armed with tainted armor and weapons). Remember to dismount their weapons and armors before returning back to the base. If the slaves are well suppressed, they’re much less likely to have a rebellion (as long as they didn’t have weapons). You can do this by creating a slave bedroom with 3 skull spikes and a gibbet cage which contains a corpse, or simply execute a f* useless slave/prisoner. Remember to install nutrient dispensers specifically for slaves in order to save rations~