"It's such a chore doing these data updates in person". Sure. On the other hand, probably more secure than having all planes connected to a mothership, where someone opens up that what looks like the latest ad for the favorite shop, opens that pdf with the latest ads, and...
also.
*please don't provide any steering input while the firmware is being updated*
"Jack! Why did you decide to update the firmware while flying?!" "Well, i do that on my laptop as well. as soon as an update comes by, i just install it! Really just muscle memory, innit?"