The company's dependable business model continues to deliver strong growth for shareholders. But its stock price remains difficult to justify.Costco Wholesale (COST +2.49%) has a habit of turning "boring" retail into impressive compounding. But the stock didn't deliver in 2025. After a rare weak stretch for the stock, investors are looking at 2026 and asking whether the membership-based wholesale retailer's shares will finally resume their upward march.After all, it's not like the underlying business is sho ...