Do you have any examples of this so we can talk specifics? The V ending is so rare! But I love a good fade, because it suits the concept of something cut in stone, as the recording, but goes on forever in your mind. So the I is there, as is the ii, IV and V. They are all represented in a package! And sometimes more. Some artists have transcended it from a convenience or device to something higher. Here's one. https://youtu.be/CsOmABqfDvo
Or Wedding Bell Blues, which I consider to be a perfect pop sonng. https://youtu.be/XvKzCspqGgQ