Exegesis of Wall-E

walarney thought this was worth mentioning said
4

I was minding my own business, eating dinner, when this thought popped into my head. In the movie Wall-E, all the people from the past (the old movies that Wall-E watches, recordings of the president) are live action. But all the present-time people are animated. Is there meaning here, or is it just a weird incongruity?