I know there have been similar suggestions in the past, I'd like contribute with a bit more of content/ideas though :3
Low Stone Fences
Think of them as something in-between a Roundpole Fence and a Palisade.
Purpose
Almost as easy to build but requiring a lot more time (and effort) to be destroyed, they're the perfect protection for that spot you keep your boats or maybe an extension for an orchard or some new trees, etc... For when palisades are not worthy and Roundpole fences are not enough
Gameplay
The idea is that it should be destroyable by hand with a fresh character but have enough hitpoints to take a while and require good amounts of energy. Similar to kilns/smelters/etc. that can be destroyed by hand but take a long while and effort.
Also, being cheap and fast to build, and relatively annoying to remove, they are an effective way to protect large territories, village borders, encircle large open areas, etc... Paving way for more direct ways to harm/ensure territory supremacy (or wage wars for it)
Cosmetic
Needless to say, it adds another way for players to customize their villages/settlements. Neat stone walls are great for animal pastures and orchards, and will look pretty around houses and such.
Gates can be similar (or the same) from Roundpole walls :3
Some images for inspiration: