It depends on how you read the sentence, I guess. If you read it as "comfortable being together without having to talk", that's a good thing, but read as "good

It depends on how you read the sentence, I guess. If you read it as "comfortable being together without having to talk", that's a good thing, but read as "good partners 'just know' what the other wants without being informed", then yes, as you say, that's bad.