Its not at all data hoarding, for me, its a matter of choice and options. This 3DS hopefully will last my lifetime. I want the ability to think of a game off the top of my head and have immediate access to it without having to do anything except flip open the 3DS lid and pick the game.
The hard limit of 300 icons on the home screen is one of very few reasons why Gateway remains the superior option: I have the 300 games installed on the home screen on a 128GB card and now any new games I want I have to get the .3DS and add it to the Gateway's microSD. There is no limit on Gateway.
I also have ~30,000 unique ROMS for the wonderful libretro/Retroarch emulators for N3DS. Same reason as having >300 3DS games. Because when I think of a game off the top of my head, I can be in the game playing in less than 60 seconds after having the thought.