Graph will tell me what kind general tuning of iem is.
Its not going to tell you how technical it is or what characteristics driver set up displays. But will you care about all the former if tuning is fundamentally not for you? I would not. And this is what graph can tell. Its not going to tell you the whole story, but it is a significant alert trigger, saying that you probably should demo first before just dumping money on it.
One key issue with graph is, that it only is really reliable if its measured into database where it can be compared to other iems that you know. Meaning that it might not be that simple to read for people who are just getting into hobby.
A primary example to above is my EVO purchase when it just went into preorders.
Graph was not available because manufacturers rarely publish one, but as i owned LX, it really was nobrainer to upgrade.
Then shortly after preorder someone get his hands on it and measures it.
Graph clearly shows a very tame upper treble region in relation to the rest of signature and it was a sudden red light to me... But there were no alternatives available so i kept it and ignored the graph.
I receive EVO weeks later and it was technically amazing ect. Most of tuning was good. Bass was good, upper mids had nice energy etc. Yet i have sold it few week later, and guess why.. yep, gutted treble ruined it for me no matter what i did.
And EVO is not the only example of me buying stuff without checking graph.
Im not writing off community impressions though as it does can help you find out about things that graph cannot show. you just need to figure out what info to take in and who from.
There are some very objective people who are experienced in this hobby and will try to give you unbiased opinion about iem even if they dont like it.
These people will be very reliable source especially if they own iems that you do.
But then, there are plenty of people who cant even tell midbass from subbass, and will only praise iems they own or will are some fanboys who are lurking in a single product thread all the time and will defend the brand even if its released a product that is generally considered a fail.
This is where you have to turn your filter on.
But anyway. I think no matter how much info we had about product. Or even if there are some red flags about product you are interested in. I think at least once we all do that illogical, spontaneous buy. Even if we feel its a fail purchase. Because audiophile curiousity is stronger.
Edit: well sure as hell i did not indend it to end up suck a wall of text