Earlier quoted context omitted.
Usually I am allergic to pithy, vaguely dogmatic summaries like this but you're right. We have traded "some sites are down some of the time" for "most sites are down some of the time". Sure the "some" is eliding an order of magnitude or two, but this framing remains directionally correct.
Does relying on larger players result in better overall uptime for smaller players? AWS is providing me better uptime than if I assembled something myself because I am less resourced and less talented than that massive team. If so, is it a good or bad trade to have more overall uptime but when things go down it all goes down together?
It is far worse if all of the competitors are down at once. To some extent you can and should have a little bit of stock at home (water, food, medicine, ways to stay warm, etc) but not everything is practical to do so with (gasoline for example, which could have knock on effects on delivery of other goods).