I've completed actual features by saying "look up issue ABBA-1234 and create a plan to implement it" to Claude.

Then I wait, look through the plan and tell it to implement and go do something else.

After a while I check the diffs and go "huh, yea, that's how I would've done it too", commit and push.

In 10 years this will be a "that's how I would've done it 10 years ago too...or?? I don't remember"