‘Outputs at close’ is very powerful and flexible. It allows one to use expression analysis syntax in event frames. Unfortunately, it is only available for generation mode 'explicit trigger', but not for 'pulse', 'step', or 'step continuous'.
If you want e.g. a new event frame started every time a value of an input tag changes (and closed again when it changes again), generation mode step continuous is what you need.
In that case it would be very helpful to also be able to use outputs at close.