GM Discretion

Life changes, realms evolve, magic and technology levels alter, skills rearrange themselves, the order of magic grafts onto different trees, clever ideas may not all work out. We call it "GM discretion," if you're a DORA, you'll just have to roll with it to survive. You can shake your fist if it makes you feel better, but it probably won't. Checking the proboards for updates would be much more helpful. Sometimes it is really galling and unexpectedly bad, so we call it a "fumble"; like you hire the best professional to guide you and they walk off the cliff while wetting their pants. You may or may not be able to try to fix it.