If they were desperate to steal a particular dog, most addresses can be found from a telephone number...
Or they can call up using the phone number and scam more info out of you, then track you down....
If someone is determined to steal a particular dog, they will do it no matter what you do. (As happened locally, where a poodle was stolen, but two other dogs were left behind - the story had a happy ending and poodle was eventually reunited after 8 months!!)
People who steal opportunistically for insurance reward etc are likely to just take the opportunity in a park or an unsupervised dog in the garden... rather than tracking down an address, not knowing what the security would be like at a given house. Or they just follow a dog home and find the location that way....
I'm all for not taking stupid risks with my dog's safety - I hate the fact that my in-laws are more than happy to leave her outside the village shop when they take her (despite the fact that they are well known in the village, and everyone would know who she was...), but I think she would be more at risk if lost and unable to be returned to me (handled incorrectly and placed in close proximity with other dogs she could easily be taken as aggressive) than from someone taking the time to work out where I live from my house number and postcode. I made a point of including the fact that she is spayed on her id disc, to reduce her value to thieves, but if she goes missing I want to make it as easy as possible to get her home.