Large bottom-side capacitors inhibit use in some cases
For the Elephant Robotics myCobot 280 Pi, I needed to cut away plastic on the bottom-side due to a couple of the large capacitors.
Although I have found some cases where the OLDI connector is in the way, it has mostly been OK, but if it was possible to move a couple of the larger capacitors to the top, that would be of benefit to fitting in enclosures with minimal bottom-side clearance.
Also, there are even products like https://wiki.geekworm.com/X1201 that have multiple pogo pins on the bottom-side that might short to bad locations on the board.