When a trooper with Frenzy becomes Impetuous, it loses the advantages provided by Special Skills like CH: Camouflage, CH: TO Camouflage (both are reduced to CH: Mimetism), Impersonation, Holoprojector (see Infinity. Human Sphere), etc. The previous answer to this question was, heavily paraphrasing, "there is no etc" with regards to ODD. Makes sense, doesn't make sense, both at the same time. We can work with that. Now that a new book (probably next year) with new skills are coming, how do we know which skills or equipment are covered under "etc."? (Note: it seems like the intent is that the trooper becomes unable to disguise themselves or enter marker state, but that doesn't explain why TO camo gets downgraded to Mimetism, but it might be easier to just say "no" instead of explaining thoroughly and then just not make any TO Camo Frenzy troops)
Each of those skills have a specific cancellation clause for Frenzy/Impetuous. ODD doesn't. Any new skill, we can speculate, will have the same verbiage included as required. Sent from my SM-G920V using Tapatalk
By "Downgraded" it means you can no longer use level 2 or 3 of Camouflage and Hiding, thus you must Downgrade to level 1: Mimetism. We will know what skills are covered by the Etc when those skills are released, so when "Impersonation Level 3: Man was the real monster all along" says in it's description "When Frenzied Man was not the real monster after all" it will be covered by the Etc.
The states have this cancellation clause, but the skills don't. Which in itself is odd. If the skills weren't specifically called out by Impetuous, would TO Camo have downgraded to Mimetism if the cancellation clause hadn't been triggered?
You are looking for origin of the rule, which takes precedence? Is it that Fury doesn't allow you to use the skill or does the state cancelling and the entry in fury is a reminder? Couldn't tell you, rules aren't clean enough for that, but to me, it looks like Fury is the trigger (origin) and the skills it effects have cancellation clauses within their associated states to let you know every skill/state pair currently effected by gaining a Fury characteristic.
Gaining Impetuous from frenzy says that it cancels skills, since ODD is equipment and isn't a skill, it doesn't get cancelled.
I'm being a bit disingenuous since I actually know there isn't an answer, but I'm hoping that by not letting it rest it might get fixed or amended without causing an upset in the future. That, and it'd been the malicious kind of hilarious if Myrmidons lost their ODD if they killed someone.
Which grants a state that is specifically canceled by gaining Impetuous. It's messy but works. Logically E/M could also disable ODD, but the rules don't say that's the way it works so it's not the way it works. Any skill, equipment, hacking program or magic spell that is cancelled will include In its rules or related state the way in which it was cancelled.
dlfleet's answer is an answer to the question, but not the meta-question. For what it's worth, the thread has served any purpose it can have, but I do think that issues like this and others need to be brought up from time to time (or possibly I should start tracking them in a spreadsheet and keep a running tally in a dedicated thread) Here's to hoping that any skill that gets cancelled or downgraded in a similar manner actually says so in the skill description and not in the state or in passing in an example or similar.
Actually, the thread has the opposite affect to what you want - because it's a non-issue, it makes it look like you're crying wolf. The list intentionally (and yes, this was discussed heavily at the time this list format was written) ends with an 'etc.' to stop it being a definitive list, so that future abilities can say that they're affected by Frenzy>Impetuous.