You can’t be a ‘present moment’ Buddhist and a ‘past life’ Buddhist at the same time, since the two concepts are contradictory. And this is probably more important than any modern distinction between Theravada and Mahayana, Tibetan or Zen, simply whether you believe in past lives or not, karma and rebirth supposedly the causes and effects of that process.
So the present moment is mostly a convenient escape, with ET extending the landing chute, because no present moment really exists, any more than a past life, but the latter is more onerous than the former, which can vanish with the flick of a whisker, while the past lives will never go away, as long as it is believed in.
Because past lives are all about predestination, and the submission to a supposedly higher will, when one is more than enough. And if this all likely began with the best of intentions, it soon became a stage prop to the caste system, i.e. racism, the idea that some are born with latent superiorities, while others are born with obvious deficiencies.
Thus your station in life is pre-determined by the events of a previous life, and there is little you can do to change it. None of that has any basis in science, of course, the racism nor the past lives. But still we have to deal with it, day by day, the racism of Aryan superiority not only in India, but in Europe and Amerika and in the latter-day colonies Down Under.
Predestination is the philosophical side to the same phenomena of past lives, the idea that ‘it is all written,’ notwithstanding the fact that nothing at all was written until a few thousand years ago, still the image is powerful, script on paper, replicating itself into countless lifetimes and universal ages.
Calvin the Presbyter made great gains with a similar theory in the Western world, details left to the deacons of stupas and steeples, the main takeaway that we are not in control, PERIOD. And that might not be such a bad thing, if the ulterior motives of religion are to be taken at face value.
After all, aren’t all religions most similar in their insistence that we subject ourselves to a higher will? For all Christianity’s eternity and infinity, the need to obey God is paramount, the only question now or later, prodigal or prescient. And so it is with Islamic submission and Hindu embrace, we Buddhists left to fill in blanks that the others have all left unfilled.
But the ‘present moment’ is something else entirely, and at its best in countering the pernicious superstitions of karma, especially the kind that jumps generations to bounce back and bite you when you least expect it, in the next life. Belief in the present moment provides a convenient counterpart to challenge all that. I would go not nearly so far as ET in extolling its virtues, since its virtues to me are simply those of meditation, whether with single focus or field focus, the result is the same.
To shut off the internal dialogue, even for a moment, is to return to proto-consciousness, paleo-consciousness, before language took over and came to own it. Now languages conquer peoples and acquire new lands, our hapless selves but tools of the medium, neither rare nor well done. Samma vaca is right speech. Right speech is good speech. Silence is preferable to bad speech. Words matter…
hardie karges and 
streaming consciousness... 
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