Good post. You are correct. Fundamentals have basically nothing to do with trading. They basically just add a potentially detrimental emotional factor to the equation. If you truly don't care about the underlying asset, but instead focus strictly on the technical factors, you should conceivably be able to make yourself a lot of money. Careful risk avoidance and rigid rules on entry points and exit points without being sucked into the emotional aspect of making/losing money should allow a person to do well. This, more than anything else, in my opinion, is why the traders on Wall Street do so well. First, they're not playing with their own money (for the most part), so the fear and greed factor can be mitigated. Second, they couldn't care less about the underlying asset. If the TA says short it, they short it. They couldn't care less about who is on the other end losing money. And third, they're not after some "big score". They're very disciplined in taking their profits when they get them and moving on to the next trade.
You brought up very good points. Well done!
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