What are peoples opinions on what would be the best universal development of the year, ie, one that most/all teams would be able to benefit from?
I'm thinking along the lines of RBR's shark fin, Ferrari's wheel rim shields, and perhaps to a lesser extent, BMW's sidepod extensions and Macca's bridge wing, just as a few examples
I don't have any aero knowledge, but I'd be interested to know what aero people think would be the development that has the most impact (in terms of it's universal application)