Which is why I rate Piquet so high.
First WDC - ground effect cars
Second WDC - no groud effect, turbo engines
Third WDC - no ground effect and turbos, first WDC for Honda, start of an era.
Its not liked he lucked into a mostly stable scenario with a dominant team.
Yes. 1980 and 1981 were prior to refuelling or planned pitstops generally, as well as being the ground effect and normally aspirated era. He won a race in a ground effect turbo in 1982, and then in flat bottomed turbos in 1983 (incorporating planned fuel and tyre stops). He then won races from 1984 to 1987 in the fuel restricted part of the turbo era, including (I believe) Pirelli's first win, having also won on Goodyears and Michelins at Brabham. He also won races, and placed third in the 1990 WDC, in yet another era; normally aspirated with no ground effect (the last of which was back on Pirellis).
I believe that to earn success across all those situations cannot be ascribed to pure luck. Prost and Senna also won races and WDCs in turbo and normally aspirated cars, and Prost won GPs in ground effect cars, but they are usually credited as being worthy multipe WDCs while Piquet is often considered more lucky.
By comparison, Vettel has won with Ferrari and Renault engines, Bridgestone and Pirelli tyres and in the pre- and post- KERS and DRS eras. This is also not just luck. Perhaps he will also win one with a turbo too!