You've lost me on the precise breakdown of growth types, but I don't think there's any kind of growth that can be sustained indefinitely without fundamental changes to a business. If you sell widgets, you are eventually going to hit the limit to how many widgets are going to be purchased anywhere, by anyone, and then you're going to have change something in order to grow.

And sure, I'll accept that it could be all right to grow past the point where your business model has to change. Some businesses do spread into multiple fields and do reasonably well in all of them, although at a certain point it might start violating anti-trust laws. My point is just that "infinite growth" as a long-term strategy can go down some bad roads, regardless of how innocent the starting point is. Even a benign tumor can be life-threatening if it grows in the wrong place, and I think that can apply to growing businesses as well.