The Bitcoin Cash fiasco is a good demonstration why their approach to opening markets doesn't work - if the correct market price at open is different from the initial price people start placing orders around, no-one can place orders on one side of the book for anywhere near market price, which means there isn't enough liquidity at open, which causes chaos. Apparently they've given up on opening the BCH-EUR and BCH-BTC markets altogether until January after this looked like it was going to happen again with those.