There is no doubt that you have to write down everything that happens to a character, whether it’s in the past or the present, because you, the writer need to have a clear idea what lead the character from point A to point B. But that doesn’t mean what you write will end up in the story at all! All those scenes that you have worked so hard on will sometimes never be shown, it will be shown implicitly through your writing. You will hint that they have happened, these scenes will appear in a conversation, never fully explained, but it doesn’t need to be. The reader only need to know the consequences of those scenes and will create new scenes with more depth, because you know more than the reader.
On the other hand, this does not have to be true at all! It all depends on the story you are making. A children’s tale, for instance, can have layers of depths, but that doesn’t mean everything is shown, but rather told, in a concise manner. It’s neither boring or superfluous because the charm of the writer bleeds through a narrative. People that read such stories know what they get into. Others will be put off by it, but that doesn’t matter. You write what you like to read, what you find fun writing and other people will find your style appealing because you like what you do.