[…] "people who have worked on this code before" is an excellent metric by which to find people to review your code.
Sure. But this is neither what I wrote, nor what the plugin does, nor what can be done programmatically in the first place, as you conveniently pointed out yourself:
[…] we can't possibly know what was a one-line typofix and what was a one line that saved us 50% of execution time on all pages. At least not programmatically.
Kind regards Thiemo