I know you're confused, thats why Im explaining this to you.
Lets take a look at an Apple hardware engineer job posting:
https://jobs.apple.com/en-us/details/200685079/hardware-systems-design-electrical-engineer-iphone
Those responsibilities could include designing or validating a connector if that connector falls within the engineers area. But a decision like adding or removing the headphone jack is more than just them.
Engineers figure out whether a 3.5mm jack fits, design its electrical connections, test its reliability, and recommend keeping/removing it.
But they still "build it in".
Ill take the L on saying the word engineer and you getting nit picky then backing off when I nit picky back, then you downplay my reponses as " dude you just googled this stuff like 5 minutes ago" because you know engineers build in USB-C ports and exclude 3.5mm jacks from their plans and get exhausted defending your argument that... Well i don't even know how to explain what you're arguing... That engineers arent involved with decisions? Even though that Apple post clearly says that the engineers must "own" their designs?