Fighting without complete armor will result in injury and even death on the battlefield. Like Futures Trading which has a higher risk than spot trading or regular trading. Basic knowledge is indeed not enough for futures trading, it takes sufficient knowledge to be able to manage futures trading. Especially psychology is also a problem for all traders even though they are already professionals. Psychology is influenced by many factors, starting from poor risk management which will result in the strategy not working properly.
As you said, Futures trading requires commitment and determination to master it, so as not to lose everything. and what is also important is the use of leverage which must be wise, and adjusted to the circumstances and risks that can occur. Liquidation will obliterate everything.
You've said something true about futures trading, but really one can never escape being greedy in trading. They may learn from their own experience, have emotional control and wise use of laverge, but things will not be as easy as we imagine and the practice will be very different.
I had to avoid futures trading because it's so hard to control my urges and emotions not to get greedy, so in the end I tended towards spot trading instead of futures trading so far. I can learn it, but I'd rather avoid something I don't understand properly.
Having emotional control when trading and being in control of your greed is something that a successful trader should obtained. Even if the focus and determination is there, patience is there, but if you end up being greedy in all your trades, you will never be successful in all your future trades. Just learn not to live with your greed, but I guess its hardly impossible.