HSBC (LSE: HSBA) shares are a phenomenon. This shows how investors underestimate the long-term wealth-building power of UK blue-chip shares. Here's why the FTSE 100 bank has been flyingWith SpaceX shares crashing by more than half following the group's attention-grabbing IPO on 12 June, it's a timely reminder of the FTSE 100's power. SpaceX and HSBC could hardly be more different. HSBC paused its buyback programme last October to fund its $14bn purchase of the remaining stake in Hang Seng Bank.