That, and those shows often remember who the MAIN CHARACTERS are, versus everyone else. Zeta Gundam racks up the kill counts earlier to pare down and focus on the living main characters, Evangelion remembers that the 3 heroes and Misato have been the primary focus of the show's dramatics.
But FranXX almost forgets the MCs from 8-11, and then again from 16-19, as well as the final 2 episodes. Reserving some characters for the chopping block allows them to go lighter on development, and have them kick the bucket to change the mood or provide drama or resolve to living characters. But by disregarding the heroes and focusing on the poorly fleshed out sidecast, half of which get about a total of 6 minutes in the final episode, it totally made you actually HATE the side characters just out of spite.