What you are not getting, is that they were not suited to land on rough fields. The spits undercarriage was too narrow, it lead to nose-overs and crashes. Same as the 109. Which is why 190's were built with landing gear extending outwards rather then inwards and why hurricanes were more suited to landings and takeoffs on rough fields then spitfires.
The spitfire was never designed or intended to land on aircraft carriers either for the same reason. Necessity caused them to be used as carrier landing ac but they were never designed for it and the incident of crashes was higher then those ac that were more suited. Servicability and longevity is also an issue you are ignoring.
I can use my commuter car without modifications as a rally car but its unlikely to last very long if I do.
Also
Ack Ack
That airfield was not a rough field. It was constructed in 1929, 10 years before WW2. It had hardened dirt runways. A 10 year old established air base is hardly a rough field. A rough field is a relatively short, possibly uneven, undrained, possibly soft, possibly rocking, difficult to land on bit of land that is used as a landing strip. It is not a prepared landing strip. Rough airfields were forward operating bases, usually near the front or close to fighting, they were temporary not established air bases.