This is an extremely limited and uninformed view of the world.
Especially considering what Boeing goes through right now, I would say the best aircraft engineers right now are located in Europe and they work in the Airbus headquarters.
But other than that: most recent innovative payment providers are coming mostly from Europe these days. Transferwise or Revolut comes to my mind as two such examples. Out of which Revolut reached a total valuation $1.7 billion not so long ago.
Also let's take a look at the online music streaming landscape: Tidal, Deezer and Spotify are all European companies.
There are whole industries (or segments at least) where SV is lagging behind.
So this environment argument doesn't hold any water.
Maybe there was a very narrow time period, let's say 10 years or so, when SV was really ahead of the pack in terms of technical skills, but those times are over.
And BTW, I didn't even mention machine learning and AI, where China is basically becoming the world leader right now.