Unless I’m misunderstanding, isn’t this “just” an issue of computing Shapley values incorrectly? If kindling is important to the fire, it should be included in the calculation; if your modeling neglects to consider it, then the problem is with the modeling and not with the Shapley algorithm per se.
Of course, I say “just” in quotes because actually computing real Shapley values that take everything into account is completely intractable. (I think this is your main point here, in which case I mostly agree. Shapley values will almost always be pretty made-up in the best of circumstances, so they should be taken lightly.)
I still find the concept of Shapley values useful in addressing this part of the OP:
Impact does not seem to be a property that can sensibly be assigned to an individual. If an individual (or organisation) takes an action, there a number of reasons why I think that the subsequent consequences/impact can’t solely be attributed to that one individual.
I read this as sort of conflating the claims that “impact can’t be solely attributed to one person” and “impact can’t be sensibly assigned to one person.” Shapley values help with assigning values to individuals even when they’re not solely responsible for outcomes, so it helps pull these apart conceptually.
Much more fuzzily, my experience of learning about Shapley values took me from thinking “impact attribution is basically impossible” (as in the quote above) to “huh, if you add a bit more complexity you can get something decent out.” My takeaway is to be less easily convinced that problems of this type are fundamentally intractable.
Emojis in display names feels like a Twitter-native phenomenon. I think it works on Twitter because of the distinction between a @username and a Twitter handle: the latter can change frequently and is often used for jokes or puns anyway.
So the orange diamond emoji fits in well on Twitter—even “Jeff Kaufman 🔸🏗👣🛝💡🌎”, while a little over the top, wouldn’t strike me as too unusual. But in most other settings (EA Forum, Facebook, LinkedIn, etc), where there’s less or no distinction between real names, usernames, and display names, an emoji stands out more. (Although 🔸 is visually simpler and more professional-looking than 🛝, at least.)
A candidate rule of thumb: use the 🔸 in situations where you’re fine with people using other emojis, and don’t use it if it might start a slippery slope toward 🔸🏗👣🛝💡🌎 where that would be unwelcome. For me that means … just Twitter, I think? And maybe the EA forum where it’s already catching on and doesn’t seem to be spurring other emoji-use.