>It takes more, not less, time to thoroughly review code you didn't write.

Nope, it takes way less. Else PR reviews would take as long as coding, which they obviously don't.

Writing 1000 lines, figuring out the nuances of the domain, fixing bugs, testing, takes way more time that reading and reviewing the resulting code.

Besides, you can even ask another agent to review it. Different brand of agent even.