I raised the point clearly
What I said was "failed to raise the point clearly enough that it became obvious what a landmine this is", which I stand by, and not only on the basis that reality does not support your assertion that you raised it clearly enough that it was obvious what a landmine this was. Your use of scare quotes indicated that there was not an actual promise - which, in fact, there was. Obviously, I'm not suggesting that you're somehow at fault here, but what you said was a pretty far cry from 'hey if this plan passes and the intention of the plan is carried out, I'm pretty sure that Ami will declare us her mortal enemies and be justified in doing so', which is what the situation required.
I feel like you are far overstating how impactful a shiny FOOM is/would be to someone who is already a jounin, especially a social spec one.
Let me paint you a picture.
Ami puts her plots in maintenance mode for three months while she grinds resolve and SC. This puts her in a position where she can take full advantage of FOOM. She then leverages her network to learn powerful jutsu and combat techniques and get access to a few shinies. (If you don't think that Ami can social her way into shinies then I'd like to point out that she'll have done just that by joining Leaf and getting SC.)
Ami has/had access to abilities of two villages and multiple clans.
So she has all those things.
She also
told us that she reviewed the personal notes/journals of Yagura - the secrets ones he didn't let other people read. If those notes don't lead to at least one shiny I will eat a hat.
So at this point in our hypothetical, she invests some more time (another three months, perhaps?) into the shinies and combat skills she's picked up. She's now both a social and combat jonin whose rate of XP gain is
still actively increasing. Six months down the line she has the personal combat capabilities necessary to take Asuma in a straight fight and give a sannin a run for their money. Her toolbox has greatly expanded - she no longer needs to pay the exchange rate for transmuting political or social power to martial power because she has all five elements, creativity, probably the rasengan, and whatever jutsu she's seduced out of Sasuke, too. She's
also been grinding her socials during this time and taking advantage of the benefits of cognitively-independent Amis as well as exploiting plot avenues previously closed to her because she couldn't punch hard enough.
The utility of FOOM to Ami is that if she gets it, because of her abilities, she can very easily maneuver herself into a position where she, a jonin with jonin XP gain, can spend three months
just grinding Resolve and SC and then explode past us. She doesn't need to spread her attention across multiple skills because she already has her core competencies at a level that will be sufficient for a few months. She still needs to juggle pyramids but her rate of XP gain is going up and she needs to add combat skills into her pyramid anyway. Anything that's a roadblock to our focusing on FOOM, she can ignore or overcome with her extant jonin abilities.
Maybe I'm overestimating the threat, here, but I don't think that what I've described is in any way implausible, and it paints a pretty grim picture for anyone who doesn't want Ami to have exponentially-increasing personal power.