In reply to Miroslav Glavić.

I'm sure neurotic power users will always take exception to not controlling every aspect of their sites, but your imaginings I think overstate the risk. You note that there is no way to test every scenario, so to that end regardless of your vigilance, there will be gaps. I just don't see the downside to assuming WordPress has done their best to ward off the catastrophic events you describe. And Microsoft has made it's share of update blunders. I believe the better idea is having backups and being able to step back if necessary.