Scaling - it’s the reason we’re all using this cloud thing anyway, right? Surely all of your applications have been tested to effortlessly scale from 0 to 1,000 in milliseconds, and your databases can rebalance after scaling within minutes with zero impact to anything important, correct?

Don’t worry, I don’t think anyone has fully cracked this nut. But why is this? What makes it so difficult to actually get ALL the benefits of the infinitely flexible cloud?