I just realize something.
Frequent Day Trading may look like playing against the noise.

But if you look at a bigger picture, short term trading is actually dependent on the long term trend of the price, provided that you trade frequent and consistent enough.

The idea is like if u're Day-trading a falling trend, the probability of the price goes down and hits the stop loss at that day is higher than that of a rising trend.

Even though the changes of probability is small and unnoticeable, but since the frequency is high, the accumulated changes in probability will be near equal to that of a longer term.

This simply means that one is wasting his energy to do so many trades while only a single trade is needed.

So if next time someone appears at your doorstep, selling you a software for AUTOMATED FOREIGN EXCHANGE DAY TRADING, and trying to convince you that you're playing against the noise but not the trend,

SLAM THE DOOR AND IGNORE HIM.
HE DOES NOT KNOW WHAT HE IS SELLING.