This is my first time i had about the journal trading because even the normal trading is not that I having interesting on it before talkless of talking about the journal trading, but for me I will never advice anyone to jump into the journal trading rather how only advice to manage the normal trading, why I say you should manage is that is because is also deserve a lot of knowledge.
However, to be honest the trading has helped a lot of people to become what they didn't expect, because some now becoming a professional traders when having a journal traders.
I don't know much about journal trading, but I think what it means is that keeping a record of your trading means writing down your trades, which can be helpful for traders because it helps the trader to realize their past mistakes and motivation to do more in their trading, although I know that many traders are not used to it, and that is why it is not popular.
But again, another thing is that as traders who know how the trading market works perfectly and have the knowledge of trading don't need the journal. As long as you know what you are doing, then a journal is necessary.