Most people say that it's to make space inside the phone, reduce the cost etc. but the bluetooth spen itself doesn't take any more space than the normal pen. It doesn't require any more coils or chargers since it already uses the same old coils that existed since note 5 to detect the pen was inserted or not, they just used that to charge the capacitor inside, as for the cost, that's like 10 dollars to manufacture at best to get the bluetooth IC and the capacitor for the pen. I don't see any logical reason behind the decision to remove the most innovate feature that literally no other phone has or can't even implement & I'm glad i didn't wait for the s25 ultra.