There is a broader scope of S3 permissions now
GetObjectAttributes
GetObjectTagging
When we are doing a reasonably broad share objects from one bucket to another say (for general services that might need access) - I suggest we include the wider set of Get permissions.
Clients don't have to use them - but for instance - GetObjectAttributes can be used to list the checksums of a multipart upload which might be useful to something.
Same with tags - unless we have a reason that we would want to prevent clients from seeing tags - this leaves it up to them as to whether they want to copy them or not.