I'm not really sure what you're getting at. I don't have cameras as a crutch for an anxiety disorder, I use them to solve property management problems. If there is something that needs to be addressed, I do so. This may or may not require my involvement depending on the issue. If a camera breaks (which isn't common), I order whatever parts that may be required if any, and fix it when convenient.

A broken camera gives you exactly the same information as a camera that doesn't exist: zero information. If this gives someone enough anxiety that they would need to drop everything, they probably need therapy.

I was wondering about the events you're monitoring home for while you're on holiday. Were you saying something more like cameras mean you don't have to do your usual rounds on foot?

Regardless, when I said "blank feed" I meant a scenareo where you're away and you don't know why the feed is blank. It's not the same as a non-existent camera: it's telling you there's a mysterious problem. Can you ignore the chance that it's an extremely urgent problem?

The cameras that people have on their homes are not necessarily places that they are at on a regular basis. Some homes are vacant, some are secondary homes, some are vacation homes, some are rentals, etc.

I've had a couple failures over the past ~decade and it has never been "mysterious". If you don't panic and use context clues, there is always plenty of information. Pretty much any foreseeable urgent problem resulting in a failure would have produced some footage that indicates the issue. And non-urgent problems that result in failure are easy to detect. (e.g. if your UPS sends you an on-battery alert, and 5 minutes later your cameras fail, you just had a power outage)

The only time that cameras go black without warning and it is warranted to panic is when you're the comic relief character in a bad horror movie.