So he trades Emini ES but does not trade Forex currencies while offering a course on Forex currencies.
With that said, not sure what you meant by the "basic market action is similar"...they are not but you're still learning and will eventually figure that out one day. The reason why they are not the same is due to the market context involving country.
There's an old message post over at ForexFactory.com by someone that showed huge differences in the backtest results of certain futures versus forex currencies via the same strategy. The difference was big enough that in any given month...one would result in losses while the other resulted in profits.
You can backtest it yourself to understand it. In addition, the resources used for each is often very different too in comparison to each other. Reason why traders that trade both in the same trading day (e.g. Emini ES futures & Forex UsdCad) will be doing 2x their normal work load and sometimes using different trading platforms.
Also, most futures accounts can be open with less than 20k. Thus, I think you meant to say stocks PDT rule to trade in an out multiple times during the same trading day for stock trading requires a minimum of 20k.
wrbtrader