3 9s is essentially an outage or two from a major storm. That’s fine for residential internet.
It's all going over the same wire. Why not put in the extra fraction of effort?
Yes and no. Even if it's going over the same wire, there are different data flows. Voice uses predictable amounts of bandwidth per phone number.
* Last mile has a downed line, yes that will result in a local outage
* Backhaul gets taken out. Re-route traffic. Drop/throttle non-SLA traffic
3 9s is essentially an outage or two from a major storm. That’s fine for residential internet.