The article cites a high workload in organising the event, a need for a creative pause and a desire to give the volunteer workforce a break.
The airfield, the local flying school and the fly-in is managed and organised by the same family-owned operation, so I'm not surprised.
While Friedrichshafen is (or attempts to be) a glamorous trade show, alienating enthusiasts and people who actually want to fly there alike, Tannkosh to me seems to be quite the contrary, so I fail to understand the comparison.