Water damage today is the cause of more insurance claims than fire or theft. Insurance companies recognize the value and a great many are offering premium discounts to those who install flood prevention equipment.
A smart water sensor does more than detect water and send an alarm. Water leak detection is only part of the solution. It's not smart if it does not prevent destructive flooding. You need to shut the water off immediately in order to prevent anything more than the equivalent of a small spill.
Stop flooding due to plumbing water escape, in it's tracks!