The content of the Data Scientist profession?

Question

Career in IT

I'm thinking of starting training as a Data Scientist. But I am stopped by thoughts about the content of the work. As I understand it, this work consists in developing models and testing them on a test sample. And most of the developed models will show unsatisfactory results. If this is true, then this makes me very sad, because. I have been engaged in algorithmic trading for the last 4 years and none of my models of market behavior has worked.
Question: Will most of the models developed by Data Scientist really show unsatisfactory results?

Answer 1

The problem is not in the models, but in the data and the ability to "cook" them -

Garbage in, garbage out

;)

Answer 2

none of my market behavior models worked

Because the environment is constantly changing
No, take at least the recommendation systems of books, music, films, they show quite a good result.