Everyone’s circumstances are different. For many homes here in Australia, gaining access to the roof cavity in older homes is pretty trivial - just lift a few roof tiles and you’re in. Most people’s sensor wires run up the walls into the roof cavity where they all lead back to the alarm panel. So tampering then becomes easy without resistors. It’s not just door sensors we’re talking about, it’s also PIR sensors. Is this likely to happen for the average Joe by the average thief? Definitely not. But getting broken into is also stastically unlikely, we prepare for the worst nevertheless. And any alarm system is better than no alarm for sure. But people should be aware of the risks with using this product, especially those who may be trying to save money in starting a small business for example. Some people might be under the impression that it is a complete replacement for their old alarm system with the same level of security.
Also, cameras aren’t going to prevent someone wearing a mask from entering since they can’t be indentified. Cameras are a great supplement but not a backup replacement for an alarm system. Cameras can tell you what happened, but it can’t stop it from happening. For example if someone learns that you will be away for 2 weeks, they know they have that long before you’ll get around to seeing their masked face on camera.