Hmmm...back when we signed up I think there may have been a combo router/wifi box available, but not mandatory. I'd try pushing back on that.
Our neighborhood is old, but the house is new (I did all the ethernet and TV coax cabling that ends up in a closet with router/switches/patchpanel/MacMini/etc), thus utilities are handled via utility poles. A Sonic technician dropped a reinforced (clever how that's done) fiber from the pole across the street to the exterior side of our garage secured at a roof rafter tail and then terminating into a small plastic box on the side of the garage. A week later a second Sonic tech patched a short fiber from the exterior box to the interior ONT.
During house construction, I installed a duplex electrical box to handle whatever internet service we'd eventually go with. We ended up starting with xfinity. They put their exterior cable box at the side of the house and connected to the jack marked Comcast in the photo, which I patched into my cable modem in the closet.
When we switched to Sonic, they mounted their exterior small box near xfinity's and routed the fiber cable through the duplex box brush grommet and into the ONT. I had pre-mounted a piece of wood on the wall to which they attached the ONT.
Oh...the legacy phone number I requested years ago and holding onto, it ends in -8080.