It doesn’t matter if you can disable it by cutting a wire, it’s the same amount of security in this case.
There were of course alarms that you couldn’t disable by cutting an obvious wire, just like there are smart alarms that you can’t actually hack easily.
Do you seriously think old alarms were unhackable?
Not being able to do it from a distance would probably be a boon to security.
It doesn’t matter if you can disable it by cutting a wire, it’s the same amount of security in this case.
There were of course alarms that you couldn’t disable by cutting an obvious wire, just like there are smart alarms that you can’t actually hack easily.