Personally, problems I have with the system are:
1. Aspect Permissions. This is an extremely vague thing that the system absolutely doesn't help me deal with.
2. *Most* canonical Stunts are IME not worth their price in Refresh, a few are too good, and there are generally very few helpful guidelines to making my own in a balanced way.
3. The system puts so much weight into in-fiction truths, yet absolutely doesn't help figuring them out. E.g. when worldbuilding, in GURPS you can ask the system to help you out, and you'll get a plausible-ish planet; in FATE, you have to be an astrophysicist a…