for most cases it would be true. i think they need to separate earning and payouts. the earning should be depending on upvote time and not the age of post. so if someone upvotes on day 15 of a post he should get rewards on day 22.
i found a few articles while researching on steem reward calculations that go 2 years in the past and i wanted to upvote but there was no point. We could also link it with a resteem so everytime a post is resteemed it would start a new 7 day cycle. so if i want to upvote i would have to resteem as well ( with a comment optional ) and the earning cycle starts again.