I wouldn't be so hasty as to attribute this answer to their "lack of awareness". Most of the time, people will choose convenience over security if they were to be given a choice between the two. This is also the reason why most people would prefer having money sent over to their exchange addresses or hot wallet addresses instead of their cold wallets. It's just way easier to transact especially if the wallet you have is more on the connectivity side of things.

I say until we get a wallet provider that offers both security and convenience, people will continue using these exchange wallets since it's just that workable having them around. The rest of us had to deal with it and continue with the not your keys not your coins narrative.