I was too busy enjoying the newer Pokemon to take issue with it, and grasped that connecting the two would have been a very particular hardware hassle for very little gain. And as is repeatedly said, we had no reason to suspect the absent Pokemon were gone for good, which Colosseum's announcement then confirmed was NOT the case less than a year later.
>>41066258Diamond and Pearl did have animated sprites from the beginning; I remember being happy Game Freak finally got that working the first time around.
>>41067378Cutting the forward-transfer cord entirely would SEISMIC, no question. The time investment lost would be far, FAR greater. Getting access to the Pokemon "back" in "waves" over the generation less so, as that is how the series went on to work anyway.