Yes, I have the agency to lose touch with people I care about, because it's not practical for me to convince them all to use a different medium. It is the FB moat. It's real.
But it is just so naive to assume I wouldn't miss out on notable pictures and news of people I love by opting out. Facebook does have some value. We're not just purely idiots. We get the trade-off. Hard opting out would have real downsides for me.