I have two of the Lego Architecture models (Farnsworth and Robie House) and they are anything but kids toys. These are highly detailed models that took hours to build, in the latter case about two days.
I feel like we're re-enacting a BBT episode right here... dear lord, you sound like Sheldon. They are toys and marketed as such. If you chose to collect them as a hobby that doesn't have any bearing on their original intended construction as a CHILD'S PLAY THING.