It's not easy to make a design by collaborating several styles into one design.
But that's the job of a designer. He did not just make a design without reason and consideration. Therefore, a brief from the client is the main key for a designer to be able to understand what the client wants.
So, a designer can make a design while still relying on the knowledge he has and also paying attention to the required brief from the client.
And this is one of the design results based on a client brief in collaboration with the designer's design knowledge.