I think this is a great metric. How do you find which hammer is better? Just use both!

It's rather pointless to look at things like material and size of a hammer. What you want to measure is the end result.

This is a good one. Also think about how confident you are you aren't breaking anything with your new feature, and how confident you would be that the next person won't break your feature.

And better if this is business feature, not some pure technical.

Sure, could be exceptions, where tech perfection equal to business value, but not many.