Everybody tries this. In the beginning contributions are easy. After almost 30 years of everybody developing on the same code base nothing is easy any more. That is normal and can't be avoided.

I agree though, that it might be good marketing to claim that. Especially younger people haven't seen that 3-5x already so they still think it might be possible. Just like a 4 Hour Workweek, or that you could be Fluent In 3 Months in a new language.