What kind of feature are you missing? Where do you notice a shortcoming of PTB?

There is currently no filter defined by us which simply checks if a command message has args, e.g. start payload

Describe the solution you'd like

Add one argument to the command filter called has_args which checks if something comes after the command in the message.

Describe alternatives you've considered

One can do this filter by themselves, but providing one would be nice

Additional context

We could also start discussing if we want to provide some way to check the content of args, like a pattern match.