If your intention is to minimize Cd in flight, then every step that does this is worth the effort.
For a plane which is yanked and banked for most of the flight time, it machs nichts what's at the trailing edge..
But..
If you want to squeeze every mile an hour or minute of flight out of the plane, then ignoring the trailing edge will not get the results you want.
I have yet to see a jet with a blunt trailing edge, or an Expert class pattern plane, or a Goodyear racer, or a thermal duration glider, or competetive slope racer, etc, where speed and or time of flight is paramount.
The StiK/Kaos family.. who cares? Anything works.