These other visas are incredibly complicated to get. And funneling everyone through student visas is just inflating demand for uni degrees.
What someone's labor is worth is up to the market to decide. Also those $100k are taxed out of the employer and employee's value.
On the benefits of people moving to the US: it's been widely studied and it's basic economics, immigrants bring both supply and demand, so the size of the economy grows and so the opportunities to current residents.
Take the extreme: when people leave a country or city the economy there collapses, see Detroit or the increasingly old and depopulating European countries.
Or take the extreme on who comes: fiscal studies show that even low skilled immigrants are net positive fiscally. Only very old and unskilled immigrants are a fiscal burden.
Finally, thinking that we can capture the world's economy in a bottle and live lavishly without competition is delusional. If we stop letting people build here, they will build elsewhere and without us. We are increasingly less relevant.