Isn't a 4-Way Splitter Overdoing for a Customer Who Has Only 1 STB

Isn't a 4-Way Splitter Overdoing for a Customer Who Has Only 1 STB and one VZ Router? How hot is signal coming from the ONT? For a customer only having one STB and one Router for internet, isn't a 2-way more than adequate? -- Light Travels at 299,792,458 m/s