The Need for Presenting Bhagavad-gita "As It Is"
From his Preface to Bhagavad-gita As It Is, here's what Srila Prabhupada himself has to say about his aim in presenting Krishna's teachings in the Gita without personally motivated (impersonal) interpretation:
"If personally I have any credit in this matter, it is only that I have tried to present Bhagavad-gita as it is, without any adulteration. Before my presentation of Bhagavad-gita As It Is, almost all the English editions of Bhagavad-gita were introduced to fulfill someone's personal ambition. But our attempt, in presenting Bhagavad-gita As It Is, is to present the mission of the Supreme Personality of Godhead, Krishna. Our business is to present the will of Krishna, not that of any mundane speculator like the politician, philosopher or scientist, for they have very little knowledge of Krishna, despite all their other knowledge.
"When Krishna says, man-mana bhava mad-bhakto mad-yaji mam namaskuru [ Bg. 18.65], etc., we, unlike the so-called scholars, do not say that Krishna and His inner spirit are different. Krishna is absolute, and there is no difference between Krishna's name, Krishna's form, Krishna's qualities, Krishna's pastimes, etc. This absolute position of Krishna is difficult to understand for any person who is not a devotee of Krishna in the system of parampara (disciplic succession).
Generally the so-called scholars, politicians, philosophers, and svamis, without perfect knowledge of Krishna, try to banish or kill Krishna when writing commentary on Bhagavad-gita. Such unauthorized commentary upon Bhagavad-gita is known as Mayavada-bhasya, and Lord Chaitanya has warned us about these unauthorized men. Lord Chaitanya clearly says that anyone who tries to understand Bhagavad-gita from the Mayavadi point of view will commit a great blunder. The result of such a blunder will be that the misguided student of Bhagavad-gita will certainly be bewildered on the path of spiritual guidance and will not be able to go back to home, back to Godhead."