Instead, they basically give the side that controls parliament the ability to pass legislation, and if they fuck it up, they can get thrown out and another party has their turn - this is essentially exactly what is happening in the UK with the Conservatives getting kicked out of power.
The problem with this "eternal gridlock" is that, since Congress can't pass anything, basically the executive branch and the Supreme Court take over legislative roles, which I'd argue is worse. I.e. the executive branch makes a ton of executive orders, which if challenged get decided by the Supreme Court, basically leaving Congress out of it nearly entirely because that legislative body is so feckless.
Let's see how long that lasts now. Overturning Chevron was a step to that very end. It puts the Department of Health & Human Services on the chopping block.
Also, this feature also works the other way: If Congress were to pass, say, abortion guarantees or Chevron Deference into law, then good luck trying to get them repealed. See also Obamacare, which hasn't been repealed after it was passed despite hell being raised.