Earlier quoted context omitted.
Scrum focuses on "systemwide" optimization where the "system" is the development of an increment of a software product from concept to completion. Letting a good developer "rocket ahead" optimizes for that developer (localized optimization) but not for the complete system (global optimization). A more "global" optimization of that developer's time and energy, since they can do twice the work in half the time, is to m…
Scrum requires that all team members are already competent and fast. Don't let this consulting company fool you.
Interesting trait of scrum - whenever there is scrum related discussion the no true Scotsman fallacies immediately pop up. By the way, scrum is actually a methodology to get something out of non-delivering teams. For everybody else it is just like throwing sand into their engine's cylinders.