If you have hot wallets you don't need to worry about your private keys, as they are the ones that have them. What I don't like about exchanges and it's my particular case, is how expensive the fees are, obviously they're not worth anything, but in my country, a dollar is a lot of money.
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I agree these crypto exchanges make their money on the transfer fees and it is pretty pricey especially when you consider how much we do on steem with no transaction fees! I think that DEX and pegged coins in a dex system could be a great way to encourage affordable trading and micro transactions!
I use my hot wallets basically to store any crypto I buy or earn through various means! It makes it easier for me to keep track of all my funds in one place
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Unfortunately, I always spend my crypto as soon as I earn it. So, all the time my wallets are empty 😁