Because the cloud remains the same?

All of what you mention is something you consider during install. Which arguably makes the install take most of its time.

Same should be true for the cloud. Because you surely are not just jumping into something without analyzing what you are locking yourself into etc.?

Yes, it sucks if your PSU goes into smoke at an inopportune time. So you don't put critical services on it. Just as you don't on the cloud either. AWS has a much worse uptime than my homeserver. Github, slack, netflix, etc too.

Also, you get to do maintenance when you know noone will be bothered by it.