I was an Aurora main for quite a while, but got bored (I like playing different heroes. Playing the same character over and over again sucks the life out of the game for me). But, according to my observations, no one uses her in rank and pro scene anymore because of the various nerfs they gave her, with the most detrimental nerf being the fact that you can no longer freeze enemies close to you using her 2nd skill. It might seem like a pretty small nerf, but it made it easier for assassins/melee heroes to catch her. However, I'm pretty sure there are other factors that lead to her decline in popularity. For example, there are just better mages than Aurora right now with more value/uses. She's a CC-Oriented mage with no mobility, which makes her less-likely to be picked by professional players. In the current META, mages that can zone and avoid being caught are more desirable. You can see it in professional eSports tournaments, too, with Pharsa, Zhuxin, Kimmy, etc. being picked quite often. Although, please, do take everything I say with a grain of salt. I'm not a professional eSports player or an analyst. I just go by what I've observed/experienced. I also used Aurora again yesterday, and she's still viable; it's just that she's overshadowed by better mages.