Okay so there is a lot of freedom in building your settlements and it appears that Bethesda is encouraging you to get lost in it. Why is there a size limit?!?!?!? For example, I was reinforcing the huge holes in the outer walls of the Castle because they can easily be exploited by raiders. I hadn't even finished building those up when the notification came up that i cannot build anything else for the settlement, that is odd considering how much freedom you have in this game. I barely put anything else into the settlement except for a small garden, a few power generators, artillery, and defense turrets.
Another thing that bothered me was the max population of 20 people. Why?