I also realized that one if the major reasons people shouldn't relate demo account to real account is the much expectations attactched to trading real account with real money.
To further explain this, most people after practicing on a demo account, move straight to real account with all the hopes of making millions or possibly making twice their capital and when that fails, they start revenge trading and end up blowing their account.
When I first started trading, a friend told me the same thing, and I felt it was right not to trade with a demo account. With a demo account, we will not be serious about starting and even trading a bit sloppy as we all know they are virtual, not real. Over time, it will form a bad habit for us and when using a real account, it is easy to make mistakes due to habit, or when using a real account, the psychology will be heavier. Start trading with a real account but with minimum capital. Don't try with a demo account, it does more harm than good for us.
According to what I have thought and what many traders do not do, the demo account is to know the tools that the exchange has, and also to apply some of the trading strategies or trading plan that you have, but in my personal opinion yes I see it as necessary to always have a demo account to see how I can react to any eventuality, and even place buy, sell, buy or market limit orders, to find out if the platform has some kind of take profit + stop loss associated with it and put it up to date. At the same time, to trade in a relaxed way and only briefly check if you won or lost, that is the menare that I like to trade.