A useful journal records more than price. For each trade it holds the setup, the planned entry, stop and size, the result in R, whether the plan was followed, and a word or two on how you felt. The last two are the parts a broker statement can never supply.
Its value comes from review, not from writing. A journal that is never read is a diary. Once a few dozen trades are logged you can group them by setup, session, size or emotional state and compare the average result in R of each group, which is how habits are discovered.
Consistency matters more than detail. A short entry made after every trade beats a long entry made after some of them, because selective logging hides exactly the trades you least want to look at. Log the uncomfortable ones first.
A journal also turns vague impressions into checkable claims. If you believe you trade worse in the afternoon, the record can confirm or deny it, and if it confirms it you can write a rule about it.
In Money Circle the journal is where trades are logged, and Trader Reflect reads that journal back to look for patterns in it.