Sue Decker argues that the growth of Berkshire Hathaway's operating earnings is more important than the stock portfolio or capital allocation. She points out that operating earnings are now $45 billion after tax, and a 12% increase adds $5.5 billion, which is as much as Burlington Northern earns in a year. This implies that focusing on operational execution can add significant value without needing acquisitions, making Berkshire's core business the key driver of future returns.