Can accuracy be expected in astrological predictions

With all said and done on astrology, the vital question remains. Can there be pin pointed accuracy in predictions. Sadly the answer is negative. Even with so called KP system which boasts of very accurate predictions down to minute level, the success rate is legendary 50-50. Why is it so? Is it because of lack of enough literature supposedly destroyed by Moslems?Or the cause is missing links in classical works purposely left blank by the celebrated authors? Or future can only be predicted generally but not minutely? Whatever may be the reason, one thing is certain. One cannot arrive at perfect conclusions with imperfect data. There are many a loophole in the basic data used to calculate charts like ayanamsa, correct time of birth, different house systems, different methods of interpretation loosely knit together etc. No wonder, with such faulty inputs, one arrives nowhere near accuracy. In fact it is a wonder that many predictions become correct, considering the imperfect methods and inputs used. But the general rule is--the star gazer usually falls into a ditch, because he looks to the sky and neglects to see the road ahead of him.