I was the Associate Product Manager assigned to Orkut as it prepared to launch. It was not 20% of his time ;-) Orkut was the backup name we had to go with because we couldn't reach a deal to get the name he wanted (eden.com) from a domain squatter.
I recently built a calculator to try to quantify the gains an org could expect as they become more "AI-native." I tried to account for a bunch of things including env, which I call "AI roadway," but I'm definitely missing codebase readiness (thank you, author), and also bottleneck analysis. Even without those considerations, though, gains are usually modest. It's hard to get to 2x.