People talk about the DAO thing as if it was just a matter of calling some people and ask them to refund everyone, as if history could be reversed. What happened was a fork, and the decision on what fork to go on still required consensus building: those running ethereum nodes and who were against the DAO fork stayed on their paths and went on to call it "Ethereum Classic".
As for gas prices: https://l2fees.info/ will show you that transfers can easily be done with a few cents, and Raiden is (finally!) live and able to do sub-cent transactions (https://medium.com/raiden-network/the-raiden-network-now-liv...)
Yes, but the people you need to trust are self-selected, anonymous, distributed, and unaccountable, which is, apparently, better somehow.
With crypto you still need to trust someone: the blockchain owners, as they can always do a rollback at any time, as happened with the DAO.