I still play gameboy on a regular basis. At this point, all the games have "aged" as much as they're ever going to.
Some people enjoy the modern features or graphics of a game above all else. (and so from this perspective, there would be no real reason to return to Borderlands 1 after you have Borderlands 2) But at this point, those people would have left gameboy behind at least 15 to 20 years ago. A gameboy was already incredibly simplistic next to a PS2 in 2001, and was therefor limited to much simpler games, graphics, and music.
Except Borderlands 2 was mindless hogwash that completely missed the essence of the first game. I still routinely play through B1 every two-three years but B2 never gets any spin time.
Why? The simplicity and laser-sharp focus of the original beats the chaotic overdriven mayhem of the second.
Some people enjoy the modern features or graphics of a game above all else. (and so from this perspective, there would be no real reason to return to Borderlands 1 after you have Borderlands 2) But at this point, those people would have left gameboy behind at least 15 to 20 years ago. A gameboy was already incredibly simplistic next to a PS2 in 2001, and was therefor limited to much simpler games, graphics, and music.