Power cord for the newest phone and pad
Why didn’t Apple design the new iPhone and new iPad so that they had the same power cords instead of having two different power cords?
iPhone 12 Pro, iOS 14
Apple product decisions cannot be discussed here. We are just users like yourself and have no insight into Apple's decision making process.
The cable that came with the iPhone can however be connected to the charger block that came with the iPad and charge the iPhone.