What if the features from Legends: Arceus that we didnt get in SV, are actually exclusives to the legends games? because it is cool and appreciated but they probably didnt put some of these (like choosing to enter battle, catching pokemon without entering battle, sending many pokemon out at once etc.) in, they either (clearly) didnt work on it enough or are making it exclusive to legends games that are to come
Still, with no news about Legends: Z-A after months, maybe they are working quite hard on it like pla and dont want to give ANYTHING away