This wrote:There's a simple reason: young drivers don't complain as much as experienced drivers, and are a lot easier to work with. Also they learn faster, and in the current era of constant rule changing, the ability to learn quick is more important than experience. Also considering that driver influence in technical development is a lot less, a drivers experience is not longer very relevant. Only in battling on track and strategy, experience can still make a difference.
I'd agree that, generally, driver feedback is of reduced benefit these days due to improvements in data logging, although it can still have its uses. Back in 2010 and 2011, Cosworth made it clear that they valued the feedback from Barrichello far more highly than anybody else because of his experience with the Mercedes engine, against which they benchmarked themselves, and his feedback on how they could modify the power curve of the engine to make it more driveable and help gain lap time elsewhere around the circuit.
Experience can sometimes cut both ways and sometimes the teams have preferred to work with more experienced drivers when major changes in regulations have come about - 2009 saw most teams field relatively experienced drivers rather than taking a risk on a young hotshot because most teams wanted an experienced driver to help with set up work, since there was a risk that less experienced drivers could go down the wrong set up path. After all, a younger driver may be easier to work with in some senses, but there is also a risk that a rookie driver might be unwilling to go against his mechanics and engineers (they can be more informed but are not infallible, and the driver may have a better feel for how a track is evolving rather than his pit wall). That is the theory, at least, although it hasn't always worked out like that...