I just finished building a trading simulator game and of course I've been wondering this the entire time. Personally, I find manually testing new strategies to be as useful as running backtests on long data series. I find experiencing the price action and volume helps me draw insights in a way that I can't when backtesting. These observations often become the basis for how I tweak strategies to further optimize them.

I'm not too worried about the impact on my game given that it's both a solo and two player game. In two player, each player is shown the same chart and they have 0:90 seconds to trade the next 200 bars. It gets pretty competitive. So, I think people will still play for fun even if manual trading 'fades'. I'll post the links below for anyone interested in challenging me (username: chartsurfer)

I'm curious to know what everyone thinks ...

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Website: https://tradingblitz.com

Android: https://play.google.com/store/apps/details?id=com.tradingblitz.mobile

iOS: https://apps.apple.com/us/app/stock-trading-simulator-game/id6748385498