1) The bug which causes updates not to display is still present so often I'm not aware a settlement needs defending in the first place. BTW this bug has reared its head in your last 4 or so games over a decade, why?
2) Settlements are still broken. Settlers often don't behave as you would expect and can stand motionless like empty, vacant vessels until they go to bed or something.
3) Some settlers seem to disappear like in Graygarden for instance. Mine says 18 but I ring the bell multiple times and I only count 16, so where have two of them eloped?
On this note, settler and visitor pathfinding is utterly atrocious, I mean awful. Like there is a trade caravan structure to build. It is designed specifically for pack laden Brahmin to loiter in and yet it is too small so Brahmin get stuck in it and repeat their mooing sound turbo style. That's if they get to it at all and don't get stuck on a fence, tato plant, another Brahmin or even just an uneven patch of terrain. That's just bad design guys, make the mesh/model bigger or the pack Brahmin smaller. Do something, because it makes me feel genocidal toward the poor things.
4) The PipBoy data for settlements seems even less accurate now than in 1.3 with exclamation marks telling me defended for Abarnathy Farm is 0 but when I go there it's more than 150. I mean seriously, the data is a complete joke and the game code for displaying it is obviously just flat out broken. You going to fix this only it's not any better than when you released the game 3 months ago.
So, the thought's there but really I'd rather the basics of settlements worked than get some abstract and portrait art to stick around the broken dolls houses I've been making. Kthxbai.