Do you spend most of your time playing away from home or something?
As for me, none of my games leave the living room anymore. And except for Halo's multiplayer, I pretty much play nothing but single-player games (even in fighting and racing games, I always play against the computer). If I do happen to play over at a friend's house, they usually have the same games I do. If not, well, I never felt it was a chore carrying around a single game with me. I used to play Halo CE LANs at friends' houses all the time back in the early to mid 00s, with all the requisite hauling around of my Xbox, its controllers, and my copy of Halo, and I never thought "How inconvenient." Now that changing life circumstances for my and my friends have made LANs a thing of the past, that's no longer a concern, and I do pretty much all my gaming at home.
I game at home mainly, but for planes and road trips in cars I want to take as little as possible. Also, when I game at home, I don't like sitting in front of the TV nonstop so I'll switch rooms I'm in, or sit on my deck or something. I like the switches portability not mainly to leave the house, but rather to be able to relax wherever on my property I want to and not just the room with the TV.
And I'm just used to digital now. I don't want to have to walk to the room with the cartridges and swap something out. I want it to be with me at all times.