so, the DLOs for any given fly-by aren't very grandiose, but there is ALWAYS some training benefit when you go out to fly. Whether it's just getting more of a feel for your aircraft, getting more comforatble flying in close formation (core pilot skillz), more comfortable talking to ATC and flying at the same time, or recovering with an instrument approach to get more proficient with IFR regimes, there is ALWAYS a benefit to flying vs not flying at all.
When we go do a static somewhere or an airshow, whatever, we get cross country experience, flying in the IFR structure experience (something we don't do much of otherwise), working with the crew, etc etc.