TL;DR
No regular big logistic grid covering roboports(maybe additional micro range roboports).Robo balancing by roboport integration with stations(not wagons).
robo-cargo-stations
What ?
Make robots limited in usage by trainstation-roboports, so rail track infra is crucial for robotics/making them less OP.-No logistic range extension(feed/drain only across rails and belts)
-Station has storage buffer and filters to load/unload wagons.
-To prevent abuse by building standalone train-stations(using them as the current roboports): while having a minimal clearance(in ratio with rail cornering, so clustering a lot of stations will generate a challenge for rails?), overlapping grids of range need to be connected by the same rail(to prevent so called communication interference)
-maybe a bigger logistic range with this roboport/only separate charging poles(with 6x6 covering range) for extending range for repairbots?
Please let me know how this idea sucks on all fronts