Do you keep the juice on until the batteries run down while waiting for the 911 response? What if your stunned gangster pulls out the darts? It has and does happen? Then what?
The most dangerous thing that cops do is putting the cuffs on a suspect. That is the first thing they do after tasing a suspect. Is that what you want your daughter/wife/mom to be doing? Holding a Taser in one hand while attempting to cuff one handed?
All going well, the cops arrive and arrest the guy, charge him with breaking and entering and he's back on the street in 30 days. Think he'll be pissed that you tased him for 30 minutes while waiting for the cops?
Oh wait! In most juristictions it's illegal for "civilians" to own cuffs!