This happens in vanilla too, some roboports will have no bots, others be full. The areas where robots will 'end' their delivery is for ALL at the same place while pick up places are spread out if you use 1 robotchest at every station and 1 near the requesting chest, and no recharge pad, what will end up over time is all the bots will be in the same robot chest and will bottleneck the recharge capacity of the robotchest. One example of use for the recharge pad is when you have 10 station unloading iron ore in a row, and you use robots to drop it all at the begining of the main bus in a single area of requesting chest. I don't particularly remember a setting to disable the vanilla roboports but i didn't need them anyway.
My experience on the subject is one year old, so it may have change, but i don't think in the way of being less viable.
