While that is a popular point of view, there're many of us who can make a nice living by watching for short term market trading signals. It's controversial, they don't always work, but my personal experience and of a few others here is that there really are useful signals.
There are guys who make lots of money with short term trading.
It’s like poker. It’s a game of skill, and there are highly skilled players, and they do win everyone else’s money.
Investing? That it is not.