The gain is that you just have to <r>un the program, and it will churn away until a warning is raised.

The 'r' command in the debugger does "return from current subroutine" (which means run the code until just after the code decides to return from the current subroutine, in case some find the former wording a bit unclear like I do). It doesn't mean "run", though it has a similar effect in that specific context. A more appropriate command is 'c' for 'continue'.

In the debugger, if you are curious what a command does, type "h r" or "h c" to get a short description of just the "r" or "c" commands, BTW.