Why is that good for AAPL long-term? Buybacks are for when the company is undervalued. It was undervalued when it was at $390, but now, I don't really think so.
Because it concentrates earnings on fewer shares. If a company reports $10.00 EPS on a million shares, and they take 200,000 shares off the market, EPS is now $12.00 on the same gross profits. I wonder why this rudimentary concept has to be repeated so often and why it sinks in so slowly, if at all. How the company is valued is irrelevant to this calculation. If a company is throwing off more cash than they can reinvest in growing their business (as Apple certainly is), then buybacks and dividends are two longstanding methods for using that cash to boost shareholder value.