Sure, I agree with that 100%. I guess if you had a scenario where you were operating near your limits and something happened that caused one or a few hosts to

Sure, I agree with that 100%. I guess if you had a scenario where you were operating near your limits and something happened that caused one or a few hosts to start swapping, and because they were up the LB kept sending them traffic instead of redirecting it to other hosts, then you could avoid a thundering herd-type problem. But that still relies on uncorrelated failures. Otherwise that seems like an orthogonal discussion to swap vs. OOM killer. It's something to be aware of and you need circuit breakers in place but I don't think it's an argument for letting hosts swap instead of having the OOM killer deal with it.