But to be called a robot it has to have some human-like (or at least animal-like) quality. Which usually involves either imitating human arms (e.g. typical industrial robot arms), imitating human movement (e.g. Boston dynamics) or using infrastructure designed for humans. If you put a delivery robot on a purpose-built path it has none of those qualities and reverts back to being a normal machine.
For some reason, it appears to be a major priority for people to drill tiny holes and channels all through their house so their cables can run through them, out of sight. This is a huge hassle as far as installation goes, but it makes up for it by also being a huge hassle as far as maintenance goes.
What's the problem supposed to be with running cables through clips on the wall? That you'll know they're there? That you can easily access them?
People want to see a finished wall, not cables, pipes, and ducts.
Install flexible plastic tubes instead and you can just pull out cables when you need to replace them for whatever reason.
How much of this is that the robots are far newer than the buildings? How soon till new buildings are designed with designated robotic paths?
Plenty of buildings are designed with hidden back-of-the-building areas and access routes for maintenance humans. I assume pretty soon they'll have the same for robots too. Then we'll really hit the Star Trek "time to climb through a duct to save the day/stuck robot" type situations.