The skyliner can be useful getting to Beach Club. It is not convenient for staying Beach Club, outside of say going to Riviera for dining or something along those lines.
To get to the parks to/from BC most people do the 5 minute walk to EP international Gateway, and either take the boat or 15-20 minute walk to HS. To take the skyliner to HS, they’d still have to walk 5 minutes to that station, get on skyliner, transfer at Caribbean Beach and continue on to HS.