You misunderstand. You can load and unload an
ECV there, it's just a different style than the other stations. The other stations have a separate area to load the ecv's. The rivieria station, doesn't have the separate area, but they can load in the general area. That has potential to delay things, as they may have to slow the line (or stop all together) some to accomplish it.
The whole separate line thing is quite rare for a lift system, so many make due just fine with a station like Riviera. It just has a greater potential to slow the system down.