But FIX _is_ going away in US equities as all of the major exchanges have adopted native binary protocols. We still have to deal with it in other asset classes,

But FIX _is_ going away in US equities as all of the major exchanges have adopted native binary protocols. We still have to deal with it in other asset classes, but I (as a developer) am not really happy about it. FIX/FAST is a massive pain in the ass relative to simple binary protocols.