And I'm not speaking to the fact that you can use wireless headphones with a phone with a 3.5mm jack.
I'm saying that for the objectives Fair set out for themselves, dropping the headphone jack is low-hanging fruit. Its one more piece that fails, it fails as a consequence of normal use (there's no way to baby the headphone jack, or the power jack, in such a way that it doesn't eventually fail from repeated usage. Indeed, they're explicitly rated for number of cycles (typically around 5000 for a headphone jack, which is consistent with daily usage for 3 years, well below their 5 year warranty. By comparison, I'm seeing 20k cycles for a cheap usb-c port, which is a lot more defensible for a 5 year warranty)), and it makes maintaining their IP rating after a repair much harder (doubly so, given that they want users to be able to repair their phones).
All for a feature that, given the price point, won't even be used by the majority of users.