But, there are trade-offs to everything. In this case, periscope lenses take up more horizontal space.
telephoto vs periscope lens

The ultrawide sensor will be moved to the top of the camera array and the telephoto will take its position, between the flash and the LiDAR unit.
YouTuber Vadim Yuryev explains that the position is being swapped because the periscope lens needs more space. It can’t go down because that’s where the battery is and it can’t go to the right because of the LiDAR scanner.
Further explanation: By putting the periscope zoom lens in the middle lens position, they can easily tweak the internal design by redesigning the logic board and moving some parts around. This is why the regular 15 Pro won’t have room for the periscope this year. (limited space)
— Vadim Yuryev (@VadimYuryev) May 16, 2023
So, it’s still very much going to be a stovetop layout and might not seem all that different from afar.