Manbearcat
Legend
That it is pointless. It is quite likely that everything we do, every feeling, every decision is due a deterministic physical systems (or random physical systems depending on your chosen interpretation of quantum theory) and to take this to logical extent we might as well simulate the character fully with random charts and the player becoming just a spectator.
The 'test' can be a narrative one, rather than mechanical one. It happens via interacting with the environment and the other characters.
On the first paragraph, I need some clarity:
Is it your opinion that if you don't have complete autonomy over a thing/situation then there is no agency erected? If you're not saying that, but you are saying that x % autonomy is required, then what value (obviously roughly) is x?
On your 2nd paragraph, that is precisely why I invoked The Czege Principle and Ouija Board play. If (a) you get to decide if a thing you care about is tested and (b) the outcome of the test is 100 % volitional, then where is the crucible? If there is no crucible then there is no test. There is just moving a planchette across a board and pretending there is some external volitional force at work and the attendant theatrics.