Are techniques used for creative writing avoided in other types of writing?

It depends on the writer. If you are in a business program, many people will say true. I personally believe it is false. Many people think that first-person writing is "unprofessional" ... and of course, as a student of or working for those people, it should be avoided. I think that removing the voice from anything makes the writing stilted. You can have professional first and second-person writing. It is possible. :)

Other techniques can carry over as well. Using description, observation, detail... these techniques are great in marketing writing, and can be helpful in writing instructions or manuals. Creative writing techniques can enhance other types of writing.