If you are a senior engineer then there is no need for you to be shipping code that you don't understand. People can definitely generate code a lot faster than before, but you also have a magic genie that can help you critique and improve the code that you're reviewing, including when that code was written by agents.

An experienced senior engineer with access to a coding agent is the most powerful code-understanding system that has ever existed. There's no excuse for shipping or approving anything you don't fully grok.