The axiom "flexible is too rigid for aviation, one has to be fluid" comes to mind.
I am not convinced that declaring a practice as stupid has a place in a modern cockpit if there are circumstances which might require the use of said practice.
If you feel more comfortable setting the park brake while waiting for a minute or two, then by all means do it - just be aware of the consequences. Likewise if you prefer not to set it.
There really is no hard and fast reason that I can think of why one should be obliged to set or not.
Similarly I can think of a few arguments both in favour of and against both methods, none of which would be immune to counter arguments.
Personal choice - remain situationally aware.