Why is the "don't leave your crypto in a centralized exchange" advice so common?

I have been in the crypto world for around a year and a half and people in the space have always told me that I shouldn't have my crypto in a centralized exchange like binance, I mean, I like the decentralized ones but just to give an example, people in every day life uses banks for everything, banks are centralized institutions and being realistic, you should have done sth really dark to get your money frozen,it's almost impossible to get around daily life without a bank account (at least in developed countries I mean) so why is that advice so common?