See my post above. There may be "super-traders" that successfully play such complicated short-term trading strategies, and they may take money from less sophisticated traders; but, averaged over all traders, short-term trading will always be a losing game.
I'm curious what you think of poker and how it compares to the argument you are making.
I don't play poker, but it seems to be a good analogy. Some players may fare consistently better than others on average, by their greater skills at psychological manipulation and play strategies; averaged over all players, however, it is obviously a zero-sum game.
However, in day trading there are thousands of players who do not know each other. There there seems to be less room for successful psychological manipulation in that case.