I don't edit. I do fix typos and grammar mistakes that I won't want, otherwise, if something isn't working, I redraft the section. Editing removes your author imprint from the prose. It's deadly. Plus, as you say, it's boring and no fun and it doesn't make the writing better.
I do not find it boring exactly. It is more like...
-Your ideas are perhaps jumbled, incoherent while you are writing. Let us say an arc is finished, key plot points are explained, the characters are shaped. But, it does not happen in two chapters. It is
gradual. There are times, often what makes writing spectacular, when an unassuming side character, enters the scene, then quietly, even without
your will steals the spotlight.
-Or, a random piece of dialogue from a hundred pages before suddenly clicks in your mind. Then you write a whole new twist.
-Therefore, you need to go back, lay the groundwork better for foreshadowing and balancing.
---> Most importantly, it takes time to set the correct voice and narrative for your characters and dialogues. The first section of any work may fall flat. Because right now, it is a blank canvas. Yes, the premise is there, but what about anything else? You see, editing is not always fixing grammar but, for me, rewriting dialogues or scenes entirely. (Which is such a pain in the ass, because when you write countless pages, everything, including your prose, becomes more polished. Then you return to chapter one. It is... tumbleweeds. It is akin to enjoying the feast at a high-end restaurant then returning to instant noodles.)