Less security (a small-time attacker isn't going to break the encryption) and more reduction/prevention of theft. These Macs end up in recycling centers because

Less security (a small-time attacker isn't going to break the encryption) and more reduction/prevention of theft. These Macs end up in recycling centers because thieves know they'll get banned/a strike from eBay if they sell an activation locked device to a customer and that customer complains to the site, so the recycling centers end up being the ones trying to resell/reuse the devices only when most of the ones they get are from thieves (or, as it turns out, IT departments that don't disassociate MDM).