It's just a tradeoff. There are advantages to consolidating on the same infrastructure for many different use cases. There is a much larger critical mass of peo

It's just a tradeoff. There are advantages to consolidating on the same infrastructure for many different use cases. There is a much larger critical mass of people working on cellular technologies than on the technologies necessary to communicate via power lines or custom radios. But of course there are also disadvantages, and this is one of them. There is always a balance between concentrating effort behind a single solution, and having that solution be a single point of failure.