However, traders are advised to have a fairly stable side income to support their finances because the market always moves freely and unpredictably.
I hope you see how you're contradicting yourself with this statement. I know the importance of having side hustle even as a full time worker but someone who's employed and have confidence in their job will not be too bothered about side jobs. Let be realistic, trading is not qualified to be seen as an employment because of its nature. No one is calling traders unemployed but all we are saying is that trading is not a full time job, it's a side hustle on it own. You need to have a main job while trading should be the side one.
The point is, you can relied on your main job because the income is assured either weekly or monthly but side hustle income is not always guaranteed and you will not feel the impact too much if you have a main job. Relying only on side hustle like trading will sometimes make you handicap due to the inconsistency of the income.