Well trained at what? Personal protection? Home security? Search (& Rescue)? I agree with Susan and Eric. "DOG = EWS (early warning system) . . . Dogs are far more useful than weird in-laws" and "Yes - if you have or want a dog as a companion/partner and understand the commitment you are making in this ages old partnership".

I really like dogs as walking sensor systems to alert me to potential threats early. Don't want a guard/attack dog per se.

A dog can help in searching, making more use of that sensor system. Excellent nose, very good hearing and their eyes are okay but canines see differently. Dog sensors complement human senses very well.
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Better is the Enemy of Good Enough.
Okay, what’s your point??