the wing loading is/has always been an opinion thing -very subjective.
On our very light models -being in the 4-7 ounce all up flying weight -used for 3D flying-the difference in loading really becomes eerie. (under 5 oz sq ft)
We can -as can other flyers - spot the difference in 1/2 ounce on a 6.5 ounce to a 7 ounce model!
On our 15 lb 1430 sq in YAK the burn off of one pound of fuel is almost undetectable. (26 oz sq ft)
In both cases the models have 2-1 (or better) thrust to weight.
For some modelers who like scale military subjects - the wing loadings -for me -are simply excessive.
Typically due to construction techniques not conducive to best loadings.