Earlier quoted context omitted.
No. Thats not at all what I said.
Then what did you say? andrewfelix was prompting you to elaborate. Just replying "that's not what I said" is completely unproductive - this is meant to be a conversation, not a game of twenty questions. We shouldn't have to guess at your meaning.
Of course past performance of a product is a factor worth considering in determining the future success of someone in any field. However if you really want to excel at this field, past performance is not likely to be the _primary_ factor (though it could be a smaller factor) in how you 'validate' future worth.
For instance, I can easily measure the past performance of stocks on the stock exchange. However if I really want to succeed in trading shares, 'have the stocks of foobar gone up in the past' is not likely to be the primary way I validate whether foobar is worth investing in.
Hope that helps you :) I didn't mean to sound as indignant as perhaps I did.