I agree, I.D. tags are very important, and it also
peevs me when I see a stray with-out a tag.
but!!!!!!
Now for the otherside of the coin.
If you own multiple dogs, that play rough, it
is possible for one of the dogs to get caught
on the other's collar thus injuring/ or choking.

I have Sheba tatooed and Rocky chipped.
Sheba no longer wears her collar around
Rocky because of her neck injury.
(but I do keep my gates lock)
Rocky and Pepper are the only ones who wears a collar/id