Official guidance from Verizon is you can use your own router as a router, by setting your Verizon router as a modem only, then connecting it to the WAN port on your router. See e.g. https://kb.netgear.com/31100/How-do-I-set-up-my-Orbi-system-to-work-with-Fios
Unofficially, it's fine. You can just use your router. The modem is in the white box on the wall (the ONT) with fibre on one end and ethernet on the other. I've been running my router directly to the ONT for 3 years without issue. It just works fine.
Little Big Adventure. That's the first one which looked so far and beyond what a console could do, in my mind.