This is false if you're only using Fios for internet service. Verizon asked me if I was providing my own router, and I said yes. The tech who "installed" and activated my ONT confirmed that I was using my own router so that he could activate the ethernet port on the device. There was nothing to bypass—it fell within their expectations.
I hear it's a challenge to avoid the standard Verizon router if you also have TV or phone service through Fios.