Republicans reverted it in the Trump era, though.

This happens a lot. Even I as a foreigner understand that Trump is routinely at odds with what long-standing cautious Republicans and right-leaning "national security Democrats" think is in the national security interest. They want the long term picture; he has no long-term perspective at all and wants the bargaining chip.

There was solid bipartisan border policy in 2024 that would have enacted strong border controls, for example — legislation Biden was very willing to sign, but Trump got Republicans who had argued for it to kill it off because he wanted to run against "open borders", not strong border controls. He wanted the advantage with voters.

Trump reversing export controls that sensible Republicans wanted for decades is not at all surprising when you consider just how utterly desperate he is to be friends with Xi (and how easily manipulated by Xi he is). Again, he thinks being able to open and close that tap himself is his own personal leverage.

I agree that in this case the calls for restrictions are coming from the corporate world. Because they want government support for anti-corporate-espionage measures.