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That was ten years or so until a useful aircraft was developed; wasn't it?
But the point is that the P.1127 was designed as an experimental prototype / technology demonstrator that through development was refined into a production model
With the F-35 production of what was close to the final configuration was decided on before any prototypes were built
The development process has been turned on tis head: instead of finding whats possible and then commercialising it, with the F-35 they've decided on a commercial product without finding if its possible.