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I didn't buy the RP Eternals myself but I do think it's a bit scummy that Riot just turns off something purely cosmetic that they do ask a lot of money for. The argument could be made that they only want them to be stacked in normals but in ARAM you can rack up take downs much faster than on summoners rift as well and they do work there.
Oh and if you have upgraded your mastery emote with eternals and play Nexus Blitz(or any temporary mode) your emote will revert back to the original unupgraded one. This is probably unintentional because it is kind of weird.
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