I don't know, brows can just make a face look ten times better. I think you're talking about the girls who make it obvious though. Every girl I know draws on their eyebrows, only one or two of them go overboard. When done right, it looks really good and looks completely natural.
They seem very unnatural this is why I don't like. But there is another type, they do partially. It starts in the middle of the eyebrow. That, is more natural let me say. Personally I don't do. But I have some friends, who applies it because they don't have eyebrows. They seem ok to me. Hey I don't judge actually! I just want them to be happy about their looks.
It looks ridiculous. I don't see the point in shaving them off just to draw them back on again. If you can't pluck or wax them yourself just go to a professional every month. It only costs about $10. Although you have to be careful with that. One of them kind of ruined mine so I do have to fill in a little area where it's bald.
A lot of girls over due it to the point where it looks like triangles... I think it looks bad... Yeah you can shade in your eyebrows but just a little bit... Not a lot. I dont shade in my eyebrows because it looks ridiculous!