>>58147430
Because they're not cool, they're tryhard. The best digi-designs were early ones like Skullgreymon, which were very quickly supplanted by greebleslop like Omnimon and coomer/furfag designs. Despite being slathered in guns and with animations of them blowing up entire cities, no Digimon has the presence or menace of a design as simple as Kyogre.
>>58147436
FP sadly BP. Digimon games have dogshit gameplay, which is why there is no "core system" to point to, unless you really like tamogatchis, IE you want to shovel Renamon's shit.