A bad command execution in large cloud providers can literally make significant portions of the web unavailable, just by the sheer number of services dependent on it.
You can’t have it both ways. You’re trying to call out all of the benefits of running your own infra, but then calling out the downsides of public cloud. Talk apples to apples or oranges to oranges. The point I’m making in the post you’re responding to is that “rolling-your-own” as an organization, specifically a small or medium sized one, comes with risks that far outweigh the costs and risks of public cloud.
The convenience is not worth the risk.
That is not the opinion of non-IT business leaders make decisions to the detriment of the advice of IT departments. You’re ignoring that good IT decisions don’t get to be make by good IT professionals. You’re always limited to the budget and power granted by your organization. That is the practical reality.