Valid points, BUT:
Given that most of these “shuttle” aircraft are not that far from the airport that “feeds” the STOL-port–does speed make much difference? For the most part, the marketplace has said “No.” An extra few knots over less than 100 n.m. is negligible.
Given that most of the airports on the video are vacation destinations–that usually means LOTS of baggage–and bulky things like skis or SCUBA tanks–compromising the payload.
Since most of the destinations aren’t connected by road, that means that everything to serve the hotel industry has to come in by air or boat–lots of air freight. “There is too much room and weight allowance for the vacation destination”–said NOBODY–EVER.
You have to ask yourself–“Would you rather fly with turbine engines, or temperamental GEARED piston engines?” Frankly, I’d rather fly in a Caravan with one reliable PT-6 (we’ve flown a Caravan to 83 countries around the world, plus Antarctica)–or better yet, TWO PT-6s on a Twin Otter.
I don’t see this as “right-sized” for the market.