Having used variants of the Nolan test (like the one at political compass) as a recruiting tool for a long time when I was working with the libertarians (long ago) I respectfully submit that David Nolan (a libertarian himself) designed that test with that specific goal in mind. I urge readers to pay close attention to subtle contextual clues in the wording of the questions designed to steer the user in the direction the test giver desires. Note that there are other variations that I've seen that are designed to steer people in other directions. The test is really an exercise in how malleable political opinions are under word choice and value choices placed on secondary words in the questions that are actually tangential to the issue addressed in each question.
anyway...
no, there is absolutely no need to identify with any political party. So why try? To save time? why bother?
A thinking person will make up his/her own mind about various issues and vote/not vote towards those ideas offered by individual members of a party.
Self-identifying with a "team" usually leads to the erroneous thinking that just because they agree with some of what that "team" does that that members of that "team" are always right and members of the other "team" must always be wrong, ignoring the bad ideas presented by ones own "team" and ignoring good ideas presented by the opposition.
Of course most people will agree with more of what one party's views of things are than some other party. Ideas from any political party tend to be interrelated to an overall view of how society *should* work (while often in large part ignoring how things actually DO work). Most people "lean" one way or another. That's to be expected. But taking on the mantle of being "with team X" often means a person is working more for the success of that "team" regardless of what that "team" is actually doing.
Note: "teams" (in quotes) in this post denote political gamesmanship. The word "party" is used when discussing how they relate to the world of political ideas, a completely separate concept.
Just my opinion.