> All else being equal, you want to produce more with less labor and other inputs.

And firms are already incentivised to increase productivity, including by offshoring jobs or replacing staff by robots, because that's their profit margin. And in this case we're not concerned with firms reducing costs in general, but firms substituting capital for labour. This was an improvement for agriculture, but it was an improvement because that labour found more productive things to do...

But if you're a government those decisions businesses make don't help unless the robots or Chinese factories are considerably more efficient at making stuff than domestic labour, because a business decision that at the margin spending a dollar less on domestic labour and 99 cents more on another production input is very slightly more efficient loses the government more in income tax receipts than it gains on anything else, and usually adds to their benefit bill. Also, people don't like their jobs being replaced. (And yet ironically, tax structures are often more favourable to companies increasing the capital input and decreasing the labour input...)

Obviously it's true that you can go too far and end up subsidising firms to keep on employees that aren't doing anything useful, but relatively minor tax breaks which mainly advantage low margin retail businesses don't do that, and they're not going to stop NVIDIA being NVIDIA either. But they might make the $45k outsourcing contract not look a substantially better deal than retaining the $50k employee.