I, consider that, in and of itself, an act that is dissrespectful to any profession. One should always advantage themselves with the proper information. If not, then just sit back, shut the hell up, and listen intently - there may just be a lesson in there somewhere. Personally I am baffled by whatever could contribute to a writer's need to cover subjects and material that they obviously have only a marginal knowledge of. They are allowed to write about music in extremely general and simplisitic terms with stock phrases and literary cliches in an effort to mask the fact that they truly don't have a clue of what they are supposed to be listening for.
Improvisation is a major component in Jazz.
No, things are turning around now espesially in Hip Hop because for a while there was a period when free styling and improvising was outright discouraged. I wasn't happy about this because freestyling, or verbal improvisation, was the element that appealed to me in Hip Hop in the first place. The fact that someone could make logical and rhythmic sense out of wordless syllables, sounds and utterances is quite encouraging. But once again the hidden powers that be, in order for them to label art, categorize and systemize it, it has to be something that is a constant as opposed to an mutating, progressive variable. And now, due to the frustrations of the public's impatience with uncreative music and efforts of bringing order to something even that they don't understand, people are starting to freestyling again.