...has coils all round and has a payload of over 1 tonne, yet other manufacturers either:
1) Give you a ute with 1 tonne but you get leaf suspension; or
2) Yet get coils but a reduced payload of maybe 650kg if you are lucky
That is just shizen
You are assuming coils are somehow inherently better. Why? I've had two 80 series and still not convinced that they ride any better than my old 60 series.
As far as the manufacturers are concerned, it's cheaper to use leaf suspension for higher payloads. The leaf does the suspending, and the locating, and spreads the load along the chassis better.
On the other hand, people are having a dig at the 'Fender for being an old design. However that old design started with leaf suspension all 'round, and migrated to coils in the 1970s (with the 110 chassis?). So on that front, the other manufacturers are decades behind.