If your product going down for an hour will lead to the loss of millions of dollars, then you should absolutely be investing a lot of money in expensive distributed and redundant solutions. That's appropriate in that case.
The point here is that 99% of companies are not in that scenario, so they should not emulate the very expensive distributed architectures used by Google and a few other companies that ARE in that scenario.
For almost all companies on the smaller side, the correct move is to take the occasional downtime, because the tiny revenue loss will be much smaller than the large and ongoing costs of building and maintaining a complex distributed system.
