An approximate ratio of the prevalence of feature without a dedicated team (or singleton) would be 99/100.

That said we could argue for days about what a feature is.

I'm less interested in what a feature is, and more curious if there's some exhaustive list internally - or if there's even awareness of all of them spread throughout the corporation.

That is, in a large org like google (or msft, or...), how much stuff is there that no current employees are aware of?

I work at a relatively small company for a number of years, and it's definitely been a challenge to maintain knowledge of feature creep that has occurred, let alone anything more in depth like what the features were _supposed_ to do.

Building a registry has been very seriously attempted at least twice but ended with the acceptance of the futility of the endeavor.

this is the best google secret ive seen in a long time

"do a barrel roll" still works.