Such Brownian motion is one of its success keys. That is, there's hardly an expectation of a 1.000 batting average. Enthusiasm for change. Promotion on merit. Obsession with the product.
Generations are months.
And also a few Hewlett-Packards and Intels. Anybody can play. It's the old-fashioned American dream brought to life. Perhaps an exaggeration. But not much of one.