To be fair, Lewis has been very open with his, and indeed his team mates data in the past. I think we have all seen some...
Being serious though, i think he has a point to a degree. Share set up, engine mode and safety info, but line, braking points etc, to me is part of the art of a driver, and pushing and trying new lines takes skill. The best drivers will generally rise to the top by working these things out, but to have a team mate effectively be given that which the other driver worked hard for seems like ot could be stopped