said by hypergiant: Is it possible Verizon is planning to replace my ONT with a newer/updated one (one that may force me to use MoCA)?
Unlikely VZ would replace the ONT unless you're getting a speed tier that requires GPON. You did not indicate what speed tier you're getting.
There are no MOCA only ONTs.
said by hypergiant: Are there any reasons why I would want to use the supplied router?
The VZ supplied router will be adequate for the speed tier you're getting. You didn't mention the router you have. Some older routers are not capable of supporting VZ's higher speed tiers.
The tech should be willing to provide a cat5 connection from the ONT, especially if it makes his install easier.
The tech will probably want to install the VZ router to ensure everything is working correctly with VZ equipment. Once he's done that, you're free to replace the Actiontec with your own router. Just be sure to release the DHCP lease before switching routers.
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Verizon FiOS FAQ »
How do I release my DHCP lease? Why would I need to?