Agreed, I cannot see the logic there either unless it is to force you to become local leaders and build the crafting benches yourself in the main area but why should you bother when they already exist 20 metres away for the Mechanist, maybe an oversight by Beth.
I noticed that those crafting stations are connected to the workshop for junk sharing.
Yeah. I found that strange.
Like i understand they dont want us messing with the robobrain central hub, but at least split the settlement into two pieces so that we can do the Mechanists rooms up.