jabird,
Yes I don't fault the Twotter for less than 800m and/or unpaved strips and in the old days, with PLH's then 2,500ft (ish) or less runways, they needed DHC products.
But PLH has long since been a longer runway and able to accommodate the likes of ATR42's, Do328's, Do228's and so on.
Trouble is that ASW stuck with DHC 50 seaters, probably because the beancounters figured they were cheaper, per seat, to operate hence the combined PLH/NQY services ... if only the beancounters had listened to the public grumbles of the last 25+ years, to the effect, that they'd rather take the train than route, as applicable, via PLH or NQY en-route.