I agree.
The only way the EP10 fits my ears if I use a keyboard o ring behind the ear tip. And even then I have to use SpinFits due to their long core. It’s the only IEM I own that doesn’t fit unless I use SpinFits (even though I don’t really like the sound with SpinFits) Otherwise, the nozzle is too short and it doesn’t fit at all.
I believe the nozzle is one of the secrets to the fit and popularity of the ZS10 Pro, ZSN, and ZSN Pro. The nozzle is perfect to fit the widest variety of ear anatomies. It’s the perfect length, the perfect width, and has a nice big lip to retain ear tips. And the shell is an excellent size also (ergonomic shape, not too big, not too small).
Of course it doesn’t hurt that the ZS10 Pro, ZSN, and ZSN Pro sound good.
I would love to see a earphone with the screw in nozzle filters. But in addition to the nozzle being sound filters, they have a few different lengths to fit different ear anatomies. So imagine something like the ED9 or BGVP DMG, but with some short stubby nozzle filters, and some long nozzle filters. This would not only allow the tuning of the sound profile to an individual’s preference, but the fit as well.