There are definitely quantifiable edges in markets. For example, if you run a backtest in the SPY etf from 1993 to present, you will find that buying after 3 consecutive lower closes on the daily chart and holding 3 days, outperforms buying after 3 consecutive higher closes and holding 3 days. This is just one of numerous examples.
You'd also find buying and holding SPY from 1993 to today would be extremely profitable. You'd still be above your cost basis after 2007. Having DCA'd into the recession your profits in the last decade would be insane.
If you dont compare your strategy to buy and hold you don't have a quantifiable edge. To OP, @SteveM's post demonstrates succinctly why TA is basically complicated tea leaf reading.