I inquired about the same topic in a previous post. The few or only response I received was that its better to have it there rather than letting the body hair clog your main bilge should you be wanting to use the on board shower. Now hair, especially when mixed with scummy soapy water, will clog your main electronic bilge. Bad if you will need to pump out mega amounts of water in a critical time. Secondly, pending your age, heritage and life style, you will loose hair, especially from your head. Ha ha.
So, as so often said, your choice, your boat.
I myself have removed the pump, leaving the hose accessible for the future, should I find some free cash to spend on a new pump. I will eventually build up the wall that separates the shower bilge, from the middle and the main bilges. I have disconnected the other end from the thru hull and eliminated that part of the T connector. The wires have been rolled up and tucked away. The switch at the main DC panel has been marked as "do not use". I'm not sure if the wall switch in the head actually works as it looks pretty cruddy.
How ever, I have put in a check valve for my "Head Sink" drain hose. I connected my electronic bilge hose, with a large loop to avoid back flow, to a T connector. Sink and electronic bilge now use the same T connector. Now I don"t have to drill another hole in the boats hull. The check valve in the sink line will stop the water from the bilge pump from backing up into the sink.
When the time comes to add the shower bilge hose, I will put in another inline check valve for the same reason.
Does all this make sense?