there is a big difference between back testing and learning what is required in order to trade effectively..for example..in order to daytrade effectively one will require a few monitors..why. simple..practice soon reveals that one monitor is insufficient to enable effective trading..this is not simulated trading..this is getting your setups "correct" before you can even trade
I daytrade since the 1990's. I started with only 1monitor. Today I trade with 1 monitor and my laptop (or sometimes my desktop). I don't need more monitors.
once your setups are correct and you fully understand them..then..paper trading..or not risking your money..is really of no use..as your emotions will not be the same..anyone who has traded knows this..common sense
First step is to build a system and test it. No need to do that in real trading. In fact you cannot do that in real trading as you have no system when you start and you need historical data to make your first charts (which means sim).
Next step is to go live, at least if you have sufficient prove the system works well theoretically.
Thanks to your backtesting and/or simulations you took away a big part of the financial risk. Of course real trading is not the same as sim, but in real trading you have a huge additional risk: you have no clue if your system will be profitable (read:you have no clue about the losses you can catch). That's the typical attitude of the self-overestimating newbie who thinks he is much better/smarter than all other traders.
The argument that real trading is different is no valid reason to take huge EXTRA risks by skipping sim and just go blindly in real trading without having any clue where you will/can end.
Do sim and understand that real trading is not the same, but have at least some basic information about your trading system before going live.
Or just say: hey, I am much smarter and better than all these losers, let's quickly get rich! We will see what will happen as I have no clue.
Sim is never like real. But why do people then first learn to drive, learn to do surgery, learn to fly a plane? Are all these people idiots? Should we not close all schools than and just start to work in the job we like without any education (sim is education). The world would become a real mess. I hope I would never have to go to a surgeon that is doing his first operation on me.
if you need to "practice" trading to improve your knowledge or dexterity..then that can be worthwhile..but to think that simulated results can be replicated with real money..well..that really is silly willy stuff!!
So in fact you agree that sim trading makes sense.