You have said it all bro, once you depends only on trading to make a living, the chances is that you are going to open many trading positions you shouldn't have opened if you have any other source of livelihood, and just because you need money for one or two of your basic needs, you will definitely ignore all the signs why you shouldn't enter that trade. So it makes you to trade under pressure, which is one of the easiest way to lose money in trading, so it's a bad idea to depend only on trading as a source of income.
Why will anybody even take trading as a source of income or let me say as the only source of income isn't that crazy, people should look for what to do instead trying deceive themselves, make I can learn from you, are there people that take trading as a full time stuff because I don't understand.
I'm not against anyone looking for different ways to make money, but what I don't advice is someone concentrating on trading alone when they also know the nature of trading, if anyone should do this, it means such person will do everything to make profit and the end might very disappointing.
Making trading the sole source of income is a huge risk. Because in trading we are not sure whether we will get a profit or not, and when we have to feel a loss, then we will definitely be dizzy because there is no income, and our capital will definitely be reduced. Well there is a big risk we will face, because it is not impossible that we will become emotional.
I always recommend having a steady income every month. Because that way at least we don't bother to cover our daily needs.
The problem is when people assume that trading is easy and they can consistently profit from trading. A professional may be able to do that, but for beginners and even for old-timers it remains a difficult thing.