So you come here very mad with your own opinion claiming "reviewers were bought" as a "matter of fact" cause an IEM failed to fill your expectations. Also, stating that CHIFI IEMs are snake oil cause of your disappointment with what appears to be your first experience with CHIFI, or you never know.. maybe a defective IEM based on your simple description of "flat" with sound signature of these pairs of Fiio IEMs.. (i cannot really related how the FH5 bass can sound flat, but you never know own's people experience, even despite graphs)
Look, It's totally understandable being mad cause you bought a piece of earphones that can be considered expensive but they totally failed to fill you expectations, which is not especially fair due to the current situation and difficult times we almost all are living together, nowadays.
IN MY SINCERE OPINION, my own experience with FH5 doesn't related to yours even after having experience similar IEMS as the ones you own such as Campfire Andromedas, which I considered them an IEM without substance with decent soundstage for an IEM and overpriced as crazy ( I know what soundstage is after having experience HD800). And Campfire Atlas, which to me, the FIIO FH5 offers a similar performance but for minus three times the price. You see many reviews praising Campfires IEMs, and I think they are absolutely overpriced and some of them are direct crap like the Polaris.., but ain't going spreading angryness walking with this air of FACT "you are all bought"...."keep your piece of crap".."you lied to me"; when we all know sound signature is a matter of preference.
I don't know whether you checked out the several reviews of FH5 here in Headfi before purchasing them or you just checked them out from youtube reviewers, or you just did both. If you checked on Headfi reviews too, you should have had good insight; or are you going to tell us that we are bought by Fiio too?
Regarding the signature. The only thing I almost agreed with what you've described aside from your "flat" description is about the soundstage nature kf the FH5. FH5 indeed has a narrow soundstage especially when compared to something like Andromesa but does has a bit of depth and height; though nothing amazing in that aspect. If your own thing is the soundstage, well in my own experience, I remember reading every single review before acquiring the FH5, and many times I encountered the "narrow soundstage" description about those IEMs, especially in wideness, like really.... many times, so I knew what to expect by just putting all the pieces together from different impressions and reviewers. Did you read enough? I don't really know.. And At last, the fact that you are labeling a IEM as a piece of crap, as one of the reasons being the lack of soundtage while having as reference the Campfire's Andromeda soundstage ( its best feature), made this look your opinion with a bit of bias, when soundstage is just a technical aspect that is a matter of purely preference. It is like me saying that the HD600 is a piece of crap due to its narrow soundstage nature compared to something like HD800. Is the HD600 a piece of crap for having narrow soundstage snd flat signature? LOL, if one said that claim you get to open the umbrella cause stones are gonna rain on you by just saying that..
Also, one last thing, who really takes seriously the "I will send you to the moon" advertising labeling that is so commonly seen in this market by many companies who trying to sell their products?