For me the order of location/transport preference is walking, monorail/boats, then skyliner/busses but I think this is highly person specific. My view of skyliner is I love riding it but more view it as an extra ride at the parks and would never want to rely on it as main transport for peak times of day.
I think the idea it’s a moderate location is because it shares transport with moderate and value resorts and can argue the moderate resort is actually the better location on skyliner. For me I view riviera location more on par with akl/ssr/okw more so then it is to
dvc monorail resorts and/or Epcot resorts (I personally even prefer ssr/okw location for ds access).