Offline pool member still recieving traffic

If you have L7 persistence (like cookies) and you have requests being made over shared HTTP Keepalive connections (such as would come from a corporate proxy) then you need oneconnect to examine each HTTP request within a TCP stream individually. If you don't have persistence then you don't 'need' oneconnect.

It's also useful as it enables serverside connection re-use - you can hold open a pool of long-lived serverside connections and re-use them.