Well, if that really may be true, maybe it is a drive type that should not be used?
Its possibly true, but there's some ways to mitigate BA distortion so that it is less prominent. Though the reason why companies use them is because they can get more specific changes to whatever target response they're trying to get. Its much smaller and they could alter the sound more precisely than using larger DD drivers which limits the alterations just due to the size constraints.
No IEM has significant soundstage and and I seriously doubt this one will have.
I have certainly heard many IEM's that are well known for staging. Its not true that IEMs entirely lack staging, some really do have an out of head experience. Notably IEM's like
-Campfire Andromeda (100% going to be high in distortion just from hearing them, but they do have the most "holographic" imaging as the audio memers say)
-Sony IEM-Z1R
-64 Audio U12T
Notably Final Audio claims to have research into immersive staging in their tuning of IEM's like VR3000/A3000/A4000, many have confirmed that they do have much more vast staging than conventional IEMs. Whether or not its due to frequency response is unknown, since all of them measure kinda strange, even though Final knows they could tune them to Harman target.
That is a total myth. The sound of an IEM is (granted a good seal and low enough distortion) purely determined by FR, as no pinna interaction takes place.
No.
I would disagree subjectively though ofc, I have tried all of the Truthear products so far and would say that they are priced appropriately, tonally they are on point, but there are plenty of IEMs that I would say sound much more detailed. Truthear would likely eventually produce more expensive products down the line w/ good tonal responses but more improved detail retrieval as any IEM manufacture does because they know everyone is just trying to chase the next 1%.
Won't show any significant differences between $50 IEMs and these.
I mean they do .... but according to folks like Oratory1990 impulse response is the most important measurement but the information is too difficult to interpret and could lead to misinterpretation if we look at it directly. Whatever information that can determine detail and staging is likely located here, but communally it's uncertain if anything can be derived from it.