I never said they did.
Yes. As a matter of fact I do.
As a matter of fact, it doesn't take much. The flume I operated had two separate lifts: 1 ten-foot lift and 1 sixty-foot lift (despite Disney's PR, Splash Mountain does not NOW nor did it EVER have the highest flume drop). When the ride shut down, it was restarted from ONE location. While there wasn't one "switch", it certainly didn't take any more than a minute to start up. The roller coasters I operated where essentially the same way. While there wasn't one "switch" to start the various systems, it took maybe a minute to restart the ride after a downtime.
THAT is my point. The presence of a CM "hosting" stranded vehicles will deter most guests (though not all) from attempting to leave. At Six Flags, NO ride is permitted to operate while any employee (except for maintenance employees) are in the ride area, including catwalks. Therefore, there should be no chance of the ride starting while anyone is where they aren't supposed to be.
Themeing is more important than guest and employee safety?