It's really something to think about: why most of it is from gen3?
I have the same feeling of comfyness about these games, but I really don't know how to racionalize it, because even if we think is because the sprites, it could be said about gen1 remakes and probably original gen2.
Yet, I think that the next gen in terms of comfy thinks after gen3 is probably gen5, only then gen2, then gen1 and gen4.