Good Morning hilmy83,Little teaspoon of sarcasm. I wouldn't go as far as saying this is "easy". I mean seriously, let's not ignore the big fat bastard elephant in the room that most traders do fail at this and quants spend millions to research small edges in the markets. Most people have average IQ, so what you did there, most people can probably do and see, so why such a high failure rate?
Obviously it's more to it than just KISS. And I personally hate "discretionary" line drawing. Everybody looks at something differently and it's based on "judgment", then you can have countless ways of drawing those s/rs.
And when it does fail, do you keep going? Stop for the day?, whats your target? KISS now becomes kiss, then pull, then push, then bust..
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You mentioned some valid points indeed, but we are alone traders not the quants. We do not have their tools and software to compete with them. and do not share with us.

Not sarcasm.