But they are also better. (Just more expensive and/or bulkier, i.e. their pros come with some associated cons.) Whereas delayed send / batch read only has "adva

But they are also better. (Just more expensive and/or bulkier, i.e. their pros come with some associated cons.) Whereas delayed send / batch read only has "advantages" in the mind of the user, who could achieve them for himself or herself quite easily.