LOL!
That only works when your feature takes 5 minutes to do or you are just copying someone else's idea. I exaggerate, but it is usually the case.
I never trust how long someone says it will take to do something in game dev. Usually it is x2 and I've worked with people where it was x3. At a past company we would ask if it was "done, done, done", because at "done, done", it was still not.
I saw a case with horizontal bars (yes, saw it on a stream!). Possibly path gen top down ray casts are missing their collider (thin or off center?), so it looks open.