I don't know. I consider a reasonable chance of success to be in the 75-90% range for the kind of things my character should be good at, with many things being automatic successes (generally not combat things, though). The Leverage crew is a good metric for how skilled PCs should be.

I am however OK with that success rate being achieved via some kind of meta-currency ("This is an important roll, and I'm not going to fail it.")

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