Tech adoption is now faster than ever, so there's numerous examples of Silicon Valley companies going from 0 to one of the most valuable companies in the world 5-15 years.
Stop thinking about the short term. You're going to be around for the long term, so you're only screwing over yourself.
There's a classic story that used to be told about Cambridge and Silicon Valley - both were good candidates for the tech boom but Silicon Valley won because Massachusetts allowed extremely harsh non-competes that prevented employees from freely switching jobs. The H1B visa vs. O1 visa argument is basically the exact same scenario - forcing workers to stay in specific positions hurts innovation and competitiveness. Once you're accepted into the US you should be free to participate in the labor market like everyone else.
The basic misunderstanding of how value and jobs are created is mind boggling to me. We should fix the H1B program because it will make us all richer and better off, including the American engineers.
The import of goods is fundamentally different than the importing of talent. Importing goods boosts the competing countries economy. Importing talent strips competing countries of their best resources. Tech talent can create basically unlimited value due to the zero marginal cost nature of software replication.