The expert opinions are more about geopolitics, like maybe don't have all your country's systems realtime depend on a foreign company.
If you are just one company whose goal is to maximize uptime without bringing in the complexity of multi-cloud, relying on AWS is reasonable. You probably won't get better uptime using something else, you'll only be down at different times than most others, which in most cases is actually worse.
For the kind of person being quoted, the stock in trade is not actually doing anything to fix it, it's in being the person quoted when something goes wrong.
If you are just one company whose goal is to maximize uptime without bringing in the complexity of multi-cloud, relying on AWS is reasonable. You probably won't get better uptime using something else, you'll only be down at different times than most others, which in most cases is actually worse.