While this makes perfect sense, and I would think it to be the case, in reality, it doesn’t seem to really hold true. This is what makes IEMs (unlike speakers or HPs) so much more finicky. Our individual ear anatomy alters how we perceive real sounds, so our perspective is different when it comes to reproduced sounds. IEMs bypass much of our ear anatomy.
Also, the point of view that one is most used to when listening to natural sounds, influences what sounds most realistic to them. Is one used to listening to an orchestra from the front rows, or used to being in the orchestra playing the viola, or perhaps the bells? Is one used to hearing electric guitars through amps or direct? Is one used to large venues or small? FWIW, I‘ve been playing drums casually for over a couple decades, so I’m used to hearing drum sounds from that perspective. I’ve also played piano, but I’ve never played the violin or trombone, so I don’t know how they sound from a 1st person perspective.
In general, I just happen to be very sensitive to resonant sounds, so mid bass fullness can very easily come across as boomy to me. I know that there are many people who perceive sounds as you do, but I think there are some who have the same sensitivities as I do as well.
