As a Canadian, I concur. I've lived in other countries with a pretty strict registration requirement and it always felt odd. I was always thinking "why do the police need to know where I live? I haven't done anything wrong".
It's really useful information for things like mailing your tax returns, verifying which municipality should receive taxes and also affects you social security. Sending voting information. For police they need to know where to send court documents and so on.
In Finland it's not really handled by police, usually done with Posti. Other great thing is that it also updates your details to most places...
