You get rewarded with a dopamine hit immediately. You are less likely to continue because you already got that rewarding dopamine hit you usually only get after you finish things.
Your work may not be ready yet, and you may need to give it some room to grow and find out what it wants to become. People only look at your work once to decide if it is for them. If your work flourishes into maturity later, people will not check it out anymore—they already decided it wasn’t for them.
One reason you should show your work early is to gauge an audience’s response. For that, you need to make sure you can see how they respond to it, for example, by sitting next to them. This person can be a friend, a teacher, or a mentor.
Yours sincerely,