Heyo.
RA here with a contact in Qorvo. Can confirm what Henry said, the 14 only has one antenna in it. I was given some additional potential reasons as well:
Cost, difficulty implementing it (i.e. no room in the phone), and that placement wasn't ideal for AoA or PDoA.
Depending on how the user holds their iPhone, their water-filled hand could cover the antenna which was just above the apple logo on previous models.
From WWDC22 it looks like they want direction information to come from the camera using nearby interactions camera assist (which is dependent on ARKit).
I guess they figure it's unlikely for the camera to be covered.
Anyway, that's my 2 cents.
Good luck in your projects to everyone who stumbles upon this thread 🫶💛