The eartip replacements are limited by the small case itself.
Apple should make the case bigger, or at least open up the inside space, so it would make it roomier for bigger tips, which should help with bigger size selections.
Apple should also include the foam tips, instead of the silicone tips, which provide better fit and better noise insulation.
The Apple silicone tips are terrible that it don't fit well and provides no sound insulation.
Tried various different brands of foam tips and none truly fit well and provide barely acceptable noise insulation. The tips need to be bigger but it won't fit in the small case.
Also, the APP updates basically destroyed the ANC/Transparency modes. The original update that was included in the APP was terrific (>1 yr ago) and had very good ANC/Transparency modes. But the later updates basically took it away. THAT has been a complaint by many users, here in this forum and on many various online forums and comment boards.