It does seem like a bit of a missed opportunity - even slipping in the most basic ots equaliser or dsp would add a minimal amount to the BOM, whilst moving from

It does seem like a bit of a missed opportunity - even slipping in the most basic ots equaliser or dsp would add a minimal amount to the BOM, whilst moving from a late 70s format aid to late 80s, albeit in a dated form factor. (Chest worn isn't too terrible IME, but expect to replace the "wiring harness" to the earphones on a regular basis.)