This isn't true. I've been running and managing 15+ WordPress websites for over 5 years now and not once run into any issues like you're describing, and I certainly haven't lost sleep or become 'tired' over it.
Using a good tool like ManageWP (or InfiniteWP, or any of the others, take your pick) makes managing multiple WordPress websites a breeze (e.g., it alerts you every morning with what updates are available), and with their paid backup/restore functionality there's really nothing to worry about if something did go wrong. Combine all this with a nice WAF or security plugin and you're fine. Or you can use a service like MalCare that combines both.
If you go months and years without updating, then yes you're asking for trouble like any other piece of software.
Too many people used WordPress over 10+ years ago and just stick to the same speech about PHP and WordPress and security and all that and how everything is so bad, and that a different CMS that nobody uses in a obscure language is sooo much better and secure (that won't be here in a couple of years in all likelihood.)