* No static IP option. That's a show stopper right there.
* No way to interface the Fusion VoIP service with an existing Asterisk/SIP phone network.
* There's no guarantee about what ports AT&T will or will not block.
* There's no guarantee AT&T won't cap our bandwidth, as they have famously done in other situations.
* We're stuck with AT&Ts VDSL modem, which there's no guarantee can be operated in bridging mode. That means my router will be stuck behind their NAT router. Sonic can't even tell me what make or model of modem I'll get.
* The actual network, dynamic IP assigned, and routing belong entirely to AT&T. Sonic's routers have nothing to do with it. When it comes to network operations, we're entirely at AT&T's mercy.
* There's no "business" version of FTTN (as there is for traditional DSL) which would remove any of these restrictions.
Please tell me if I'm wrong, but otherwise I just can't see how FTTN is useful.