I guess my opinions on balance are either very much off or I just don't see the current card designs as problematic. Or maybe I'm operating in a different gaming environment.
Milan Christopher is certainly a great card for seekers who want resources, but he does not in himself cause a problem. Seekers are more often than not going to run into problems that have nothing to do with resources or could get a boost if they opt for different allies. It comes down to deck playstyle for me. Milan Christopher's upside is that he is never going to be a bad card that does nothing.
But maybe I want to run a very skill heavy seeker that needs very few resources. I would prefer Charles Ross because Charles lets you pay for other people's items. That is not nothing. Seekers often have less use for resources than other factions, and if you can help a guardian get out a weapon, how is that not better than a +1 to a test you are already going to pass and a resource you don't really need?
There are very few cases where I feel like these cards actually ARE problematic, and even fewer that I feel need nerfed with errata (probably none). I hear Drawing Thin may make some waves, but honestly, I don't feel like this game is a game where there is one-card-to-rule-them-all, and I find it hard to believe I ever will.
Key of Ys is amazing (if you draw it, if you can afford it, if you can play it, if you don't mind giving up your accessory slot, if you can keep it in play or have a way to soak sanity loss) and if you choose to spend your time and experience collecting it and digging for it from your deck, why shouldn't it be rewarding? And if you feel uncomfortable with the results making things too easy, you can play hard or nightmare and do your best to alter the chaos bag to meet your desired difficulty.
This whole thing is a bit shruggy-shoulders to me. I appreciate balanced cards, but outliers are the exception, not the rule currently, and if they do make the game boring, I opt for a different kind of play.
You guys are all fantastic and intelligent people, and I love these discussions in general as well as the threads of endless speculation. I just sometimes wonder if there is a bit too much anxiety over that speculation, and while the Devil may be in the details, we're missing the forest for the trees. (And mixing our metaphors, because we all know that in actuality the Devil is in the trees, and we often miss the forest for the details
)