GetAtt coverage

I'm not using the template on this one because it cuts across many services/resources/etc.....

If a resource has an Arn, Fn::GetAtt [myResource, Arn] should return said Arn. If I get a cfn failure one more time because !GetAtt myResource.Arn is undefined and !Ref myResource returns the Arn instead, I will write a VERY sternly worded tweet (maybe a couple).

I recognize that there's a bigger debate about "Arn all the thingz!!!" bu tthat's not what I'm asking for. All I want is GetAtt Arn to work if the Resource has an Arn.