I imagine you’d be primarily looking at communication devices, since that’s the primary use for emoji. I would think out-of-the box support would be spotty for e-ink devices, where the greyscale display would also make em look pretty bad even if they did work. Depending on the symbols used, legibility might also suffer in different color modes. Honestly it’s probably easier to just embed an emoji font than it would be to compile a list of devices that don’t need you to.
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