Why Lili isn't more popular?

Maybe it's just because I'm Silver, but in my opinion, Lili is a very strong hero and quite underrated. I win almost every game with her, especially in Ranked. I usually go for the Dragon build and keep Q pressed during fights. In my view, the ability to automatically heal the ally with the lowest health is extremely useful. Additionally, the dragon allows me to deal a huge amount of damage while also healing allies. A great ultimate that can save the whole team. Am I missing something? Any hidden weaknesses?