> The company mission is just one of the Sillicon Valley tropes, another one is the idea of "changing the world".

Maybe you think of it this way because of how much its abused. At its core, I do sincerely believe (still) that Silicon Valley does represent a unique force of change in this world unlike any we've seen before.

Semiconductors and then Software: it has changed the world (for better or worse, that's another question).