For security, I never have callsign license plates. It is too easy too lookup a home address with a callsign.
With so much road rage these days, they could drive to your house. You might say most do not know they can look up your address, but all they have to do is Google the callsign and probably at least one callsign lookup site will be returned. Granted it is not very likely, but can certainly happen.
Someone looking to steal a particular make and model of vehicle will know where to find it.
Some pervert might notice and fancy the looks of your wife, child or girlfriend and try to find them home alone.
Sure, they could just follow you home, but they wouldn't have to.