Because of the far and fast reach of the internet, we have an ability to share our work almost as soon as it is made, and to share it with a larger audience than ever before. Furthermore, that audience has the ability to issue feedback immediately: in fact, it’s encouraged. Like it. Comment on it. Up-vote it. Or otherwise. And the danger is that we know what others think of our work (less a full thought, really, and more a knee-jerk reaction) before we’ve lived with it long enough to really know what we think of that work ourselves.
Other voices easily drown out our own before we can really hear it. And this applies whether you hear positive or negative reactions; both are dangerous to us. Positive feedback too soon will stop us moving forward or going deeper. It’ll stop us at the low-hanging fruit and the first, most obvious iterations, and our work won’t have a chance at getting honed. And negative reactions or feedback can stop us just as quickly when that feedback often only means “this work isn’t for me” and has nothing to do with how authentic or good it might actually be.