Of course. Why preach to the converted? And if you think "classists arguments" are outdated in an era of inequality unseen in the US since the 19th century, perhaps look more to history.
>why would anyone in SV settle for the stifling mediocrity and onerous rules of a union when millions are out there to be had for any with the courage and drive to try for it?
Because under the conditions of contemporary Capitalism, believing in venture capital as your ladder to the moon is as mythically fictitious as your description of unions.
Don't get me wrong - technology and its impact on society is as revolutionary as was industrialization. But it's also obvious that a similar class of robber barons is attempting to subvert this revolution into a new Gilded Age. In that era, the laboring classes, through their solidarity and protest, stopped their children and families from being worked to death, their land being poisoned, and generally having their futures stolen from them. What you have the privilege of calling "stifling mediocrity" is only because of their sacrifice.