For a platform that focuses on "reading", I believe having TTS is essential help for people with slower reading comprehension (me), as well as for those with disabilities related to sight. This is currently a feature most commonly enjoyed in book reading apps, which makes me want to compile my own EPUBs just to get my app to speak the stories for me.
I really hope Qidian gets this feature soon! I'm sure it'll attract a lot of readers (or listeners, in this case).