> almost total reliance on prosecutorial discretion is a terrible way to run a society

Asking for precedence is not the same as "total reliance on prosecutorial discretion." It's asking if a hypothetical is grounded.

> moment that federal prosecutors stop being obsessed with 100% conviction rates, the whole weaponized process becomes tyrannical overnight

This is an orthogonal problem. Prosecutors can bring bullshit cases with zero basis in the law if they want to.