On LinkedIn everyone is 10x. In real life the gain is real but measurable — if you don't kid yourself.
Metrics that matter
Story → prod time, bugs within 7 days of deploy, time to first PR on unknown repo, cost per story.
My 12-month numbers
Story → prod: -42%. Bugs stable. First PR: -68%. Cost per story: -35%. Net ~2x, not 10x.
Biases
Selection, scope, latent quality degradation.