Because a tech worker is highly skilled labor that would leave the country and therefore henceforth would not be available to the labor pool of said country, which arguably will have negative long term economic effects.
This problem occurs precisely because foreign tech workers are being treated differently. You are also glossing over the fact that those tech workers are on their path to become citizens.
This problem occurs precisely because foreign tech workers are being treated differently. You are also glossing over the fact that those tech workers are on their path to become citizens.