"TA can't possibly give you a greater than 50% edge" sounds awfully similar to "it is impossible to make a living by playing poker it is all just luck" to me.
Speaking as someone who doesn't day trade, doesn't know much about TA but makes a living from poker.
Speaking as someone who doesn't day trade, doesn't know much about TA but makes a living from poker.
People tend to overrate themselves on pretty much everything that they're not amazing at (and ironically may sometimes doubt themselves if they are actually good), so obviously if they can't do it, it can't be possible. That's usually why losing players/traders say it's not possible, and winning players/traders question every single move that cost them money.
+1