OP As far as I can elaborate on your reasons, I disagree with you pretty much as you say. Because I think if you are a successful trader you will never deviate from this path. Although it's stressful monthly, I totally disagree with what he said because of number three. No matter how many scams there are in the market, it will not affect the traders if he is an experienced and excellent trader. I am a spot trader but I don't trade all the time most of the time I invest. When I trade I do analysis for minimum 15 to 20 minutes and then I trade on that. By doing this I do not have to face loss.
Analysis only for 15 to 20 minutes and that's enough for you to make your trades? Well, even though I know it can differ for each trader, I believe it is extremely difficult to understand anything within 20 minutes, especially if you are into altcoins because they tend to be more unpredictable than Bitcoin in general, so when you are making a trade in altcoins, you need to consider a lot of things and do enough research and analysis before you go ahead with your trade.
Talking about trading as a lifetime job, I think if a person has enough knowledge and experience about the market and they have enough money that they can use to earn a reasonable amount each week or each month, there should be nothing wrong with continuing with trading as a full-time gig. It could only be a problem if a person isn't able to earn money from trading and instead lose their invested capital.