Good post, but I have to disagree with you @fyrstikken
Remember the first rule of crypto
If you don't have your keys, then you don't have your coins.
Also the golden rule of crypto
He who has your keys has all your gold
That means products which do direct decentralized p2p exchanging are the most secure, except possibly cold storage.
Have a look at bitsquare and you'll see why you don't have to trust any exchange that isn't running on your own computer.
https://bitsquare.io/
totally @williambanks - but this article was meant for steemit-users and steem & sbd are exchanged on Bittrex, Poloniex and Bitshares. The points you raising is good material for another article.