If we are talking only centralised exchanges, then I fully agree. If talking decentralised exchanges then hardware wallet always in our custody is probably as good as we can get.
This post sums it up, basically it is better if people can make informed decisions and evaluate the risk for themselves. The alternative I suggested at the end of the same post, more thoughts here.
Sure, and they also have a list of negative news stories which is unique in the exchange world so should be considered before signing up. I know of no other exchange that has gone to court to protect the identity of what appears to be some extremely sophisticated criminals (look up how they did it for each hack behind the news stories). Criminals that have stolen significant bags of cryptocurrency and cashed out on Bittrex. Repeatedly. Over long time periods. I have not the time or desire to do the analysis as I could not seriously consider it as an option, but searching on this exchange appears to turn up a larger than normal amount of individually hacked accounts with large balances (as apposed to one huge hack like the Bitfinex disaster, also even more highly “trusted” on that list you posted but if I recall not one of your favourites).