This is complete nonsense. You need to understand the problem you are addressing even if you plan to use deep learning methods for them. Saying you don't need

This is complete nonsense. You need to understand the problem you are addressing even if you plan to use deep learning methods for them. Saying you don't need to know anything about TTS is like developing a self-driving car and saying you don't need to know anything about the rules of the road. For one thing, how are you supposed to know when you got it wrong? And what things it is important to get right?