I don't see how computers made us better traders, other than it presented the market in a better way, we still made all the decisions just like the day we made hand drawn graphs.
You forgot that in trading simpler is better, additional variables doesn't neccessarily produce better results, and this has been confirmed in many many backtests.
Market is also constantly changing, and machines must be updated, last time I checked we haven't had any true artificial intelligence that can learn by itself yet, ultimately, traders program the machines, and the machines are as good as the trading systems behind them.
Last but not least, as I said, by the time the machine can outperform traders en mass, most of the professions would have been long gone. I personally just can't see it happen any time soon, unless we are doing a "Matrix" . . .