I routinely get into a situation where a robot is bringing a substation to a ghost, but the robot is waiting around an unpowered charging point. The charging point is unpowered because of the missing substation, creating a loop where it will never get built without player intervention. I wouldn't have brought this up, but it does not happen with Roboports, so I assume there is some mechanism they have to prevent this, which the charging points don't.

I posted a screenshot here: https://www.reddit.com/r/Seablock/comments/11s3vq2/robots_keep_getting_hung_up_on_powered_down/

Also, I love the modular roboport concept. Any reason the range extender isn't the same as regular roboports?