That's a bit shortsighted. There have been cries of software becoming needlessly bloated and inefficient since computers have existed (Wirth, of course, but countless others too). Do you visit any gamer communities? They are constantly blaming careless waste of resources and lack of optimization in games for many AAA games performing badly in even state of the art hardware, or constantly requiring you to upgrade your gaming rig.

I don't think the only scenario is boring CRUD or line of business software, where indeed performance often doesn't matter, and most of it can now be written by an AI.

The in-code tests and the expectations/assumptions about the product that your users have are wildly different. If you allow agents to make changes restricted only by those tests, they’re going to constantly make changes that break customer workflows and cause noticeable jank.

Right now agents do this at a rate far higher than humans. This is empirically demonstrable by the fact that an agent requires tests to keep from spinning out of control when writing more than a few thousand lines and a human does not. A human is capable of writing tens of thousands as of lines with no tests, using only reason and judgement. An agent is not.

They clearly lack the full capability of human reason, judgment, taste, and agency.

My suspicion is that something close enough to AGI that it can essentially do all white dollar jobs is required to solve this.