I think this contains mostly correct analysis with respect to hiring experienced talent, but under emphasizes how unique each process is per company. Experience is a positive, but less positive because of it.

There is a lot of potential that could be made from newer hires combined with focused in house training/experimentation - which is what all these businesses had to do in their initial expansion - with not enough people of experience at scale available, and they probably had to do a running training ramp up multiple times over multiple generations of growth. This is in general is an underutilized strategy - esp for mature companies that need to essentially build a new generation of tech in-house.