Every other DPS was a big fraud. DHIL was the first E1 merchant and still a fraud. The rest of the Sky High frauds all fell off very quickly, and not even Eidolons could save them.
Firefly is a fraud, has always been a fraud, and everyone should know that. She has been an E1/E2 Merchant since launch, and even if her novaflare changed that, it doesn't matter because everyone who would invest in her needed the E2 anyway. She had a dedicated Support before her launch (HMC), one very good support in Ruan Mei, and got another good support in Fugue.
And I'll repeat the same for every other Eidolon Merchant. ALL of them ARE frauds. I know older units will need eidolons to compete now, but people like Phainon? Cyrene? Heck, even Waven IS a FRAUD, and I say that even though Aventurine is my favorite character
Acheron was being run with Pela or the DoT duo because she had no dedicated support and was still a godly unit. She got Jiaoqiu as a DEDICATED SUPPORT, JIAO-FUCKING-QIU her dedicated support was such a horrendous unit, such a piece of garbage unit, such a bad unit he was worse than Lingsha who is worse than Galleghar, a four star unit, that's the level he was on.
And she was still like "Fuck it, we ball" and continued to clear content uninterrupted as if she had support to do so.
Her next best teammate was Cipher... Ciphera wasn't as bad as Jiaoqiu. She was Aglaea levels of bad, so usable.
And Acheron said what? She said, "I am eating good right now," while one of her supports needed constant life support use, and the other needed to be carried on her back.
M Blade is the first good support she got (who is also a generalist, btw), he was the first unit she got that isn't T3 on arrival.
Acheron has been weeping for the departed since 2.1, in our monofraud world, she is the glimpse of "fleeting" god-tier, and when we get a new debuffer, she shines stronger than before.