They did listen, though. They listened to the part of the community that wanted Anti-Star Guardians. They just went in a different direction with it than what we were expecting. These skins are still Anti-Star Guardians, after all, having had their gems damaged by Zoe, thus corrupting them like she is.
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Zoe is corrupted, and she corrupted Ahri's old teammates to make her own team of corrupted Star Guardians.
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Neeko(the yellow gem) apparently survived, and so did Rakan(the green gem) to some extent, but Xayah(the blue gem) didn't. That's what Rakan gives his life for Xayah's, giving her his green gem to make her whole again(and thus turning her green, like his gem), because that's the only way to save her.
I am running under the assumption that, in the lore, Ahri figures out a way to repair the gems or create new ones to save her old team, which is how Neeko comes back. However, perhaps Zoe damage's Xayah's again so she can't change back, which is why Rakan isn't actually using his gem, because he wants to use it to save her.
They could very easily fix this by renaming the skins, though, thus making them a new line/new theme.
Riot heard our pleas for something new and different for the Star Guardians, and they delivered, and I can't be mad at them for that. Am I sad that there are no normal SG skins? Sure, but they can't please everyone. Even if they released varients for these skins to make them true SG skins to make the people that wanted true SGs happy, the rest of the community would call it a cash grab and get mad at them over that. They don't release the varients, you guys are still mad. They scrap the skins entirely, basically everyone is mad. There's just no winning, because with this community, there is always something to complain about, and fixing it does nothing because it just opens up a whole new can of worms.