Noah , you have part of the equation correct... Some reasons for hack... learning how to fly in cover /winds/landings etc. they get a bit of independence, they are quiet when brought in,almost to what you would call passage yet there is no fear as in a passage. They start to develop a hunting and eventually killing attitude.... They learn about not being able to kill little birds that will buzz them, that bugs don't taste good, and many other things that a hawk tied to a perch or left in a mews until hunting season doesn't know. Falcons I can't say what a tame hack does for them as I don't dabble in them but it is a great way to raise a hawk. The liklihood of them getting ruined by a run in with game is slight, though possible. The greatest of fears are these... predation, accidents, lost if telemetry quits, and to much independence once they learn they can effectively kill game from a perch.
Having lost my best gos ever for a month during the molt one late summer, she came back with a new understanding of how to survive, and would completely refuse to hunt from the fist , and never did really ever get over that urge to take a perch . As I said it's not for everyone, but for me, it's a great training tool to develop my hawk during it's natural training period.
Barry
"you believe you understand what I said, do realize what you heard is not what I meant"
Barry