If the value of the coins you own is a few hundred $, maybe you can live with the knowledge that you can lose them at any moment. But when it comes to a few thousand dollars, few can afford such a loss - and there are users on the forum who have lost very large sums of coins because a $50 hardware wallet was too expensive for them. It is your decision whether to invest in security or not, but anyone who understands what crypto is will tell you that it is not wise to keep such things online.

I see you're a trader so you can’t avoid having a certain amount of funds online, but in any case the correct option is to move them from the crypto exchange when you stop trading. Even a desktop wallet can be a safe option if you take all the precautions.