I certainly used to have your view.
That everything should be tested and results tabulated to a "blueprint" from which to work.
If there was one piece of advice I would give to a new comer it would be to learn how to trade long term profitably first before attempting to trade shorter timeframes.
Further I would certainly tell them to learn how to develop profitable trading methodologies through backtesting.
Trading shorter term is a completely different ball game. Discretionary variables cannot be successfullly tested with the software I know of.
But I can without reservation tell you that my experience is that when trading short term you'll satisfy all those "Numbers" if you get on momentum and ride it as long as you can and then get off it!
Sitting in a stagnant stock not only means no profit till it moves BUT ALSO opportunity cost.
So I'll have to disagree with both you and Snake on this one.
Pronouncements one way or the other without solid data behind them are meaningless.
They used to also be to me as well.