Maybe they do and I just haven't seen it happen in so long but can raiders still drop right into your colony via pods? My colony is 90% open with windmills everywhere and a hell of a wall. But I fear the day a raid might fall right into the middle of it. Especially with the amount of devil strand growing in the fields.
Yup! I had a couple sythers drop into the dining hall of my mountain base.
Doesn't happen often but enough to keep you on your toes.