Comment by chungy
"Generations" is a fairly subjective term all things considered, and I basically acknowledged it by saying these things are fuzzy.
As the sibling post mentions, they all have exclusives, however, which is something Sony has refused to allow for PS4 Pro and PS5 Pro updates. And even though Nintendo considers the GBC to be the same console as the original GB when it comes to tallying sales figures, it's a rather significant upgrade. Slightly better than NES full color games, double the processor speed. It made a compelling upgrade and target for developers.
Back when they were first coming out, a lot of us also considered GameBoy Pocket to be a new "generation". I think it might have supported a few more shades of grey from the original? And better battery life. And lots of case colors.