I spent a little time studying horary, Ray. My reasons for declining it are fourfold:
(1) I am not active in any particular denomination now, but I nevertheless believe from my residue of spirituality that the fortune-telling types of astrology have the inherent danger of turning people away from faith in God (or the universe, for atheists) to support them. This is a huge issue, often trivialized by both evangelical Christians as well as some astrologers who critique them. At difficult moments in life, an abiding faith in one's Creator will carry one much further than reliance on horary astrology. I note that the Bible does not condemn character analysis from natal chart interpretation, which is the type of astrology I focus on.
(2) It has taken me a long time to feel I've gained any kind of mastery in modern astrology. I would rather do one sort of astrology well than multiple types badly.
(3) I do not wish to respond to most of the types of horary questions that I see in Internet forums. These range from a distraught mother wondering if her missing child is still alive to the most trivial of questions written by women who seem to prefer horary to getting a grip on their lives. People who do horary are often inundated with such requests. To me, these are misuses of astrology.
(4) After having read Geoffrey Cornelius, The Moment of Astrology, cover to cover, and William Lilly in bits and pieces, I still do not see the basis for horary working, beyond those individuals for whom studying astrological symbols awakens a kind of psychic ability that I do not claim.
So in my universe, Pluto sextiles Neptune just as much as Neptune sextiles Pluto. Either way works for me.