Because then you have a situation where the player can choose to throw money at npc assistance, or the players that provide the service have to provide a better option than some AI pilots. Clone soldiers or something.
Isk sink + incentive.
Oh and hauler npcs would use autopilot for their ships, greatly increasing the risk involved in having them move items. You’re either not reading or just don’t want npc allies period, or both.
I’ve already provided multiple reasons why the addition could be good for the game, trying to shoot those ideas down and any others isn’t productive.
Regardless, everyone uses drones and drones die in droves. Adding npc allied ships means killmails for those hunting, and slightly better security for those using them for defense. Plus it would be an isk and resource sink, and would make roaming more rewarding since it puts more stuff in space. There’s loads of other bonus’, but it wouldn’t be fair to completely shoot down the “No npc mercs in my eve!” argument, because that shuts down discussion?
Same problem if the dude had player mercs assisting him.