Fairphone 4 doesn't have a 3.5 mm jack beacuse reasons. So much for sustainability.
I honestly (not hyperbolicly) don't see how a phone not having a 3.5mm jack is relevant to the headphones _having_ a 3.5mm jack
By your same logic, if you need to use dongles with a brand new MacBook, today, is the MacBook thus not useable?
(I don't use a MacBook in 2023)
The dongle solution seems to only be good for sitting at a desk. Not for a device that is literally called "a mobile".