The E4 will always know if your pokemon is Zoroark, despite the illusion effect.
They have access to way too much info that they should not have, and they actively use it against you. Would be nice if these assets were exposed to the community like the UI sprites so people could make asset swaps, but I don't know if that's in the cards at all.
The magnified profile shots aren't stylistically much different between Gen 4 and Gen 5, but I feel the player profile sprites in PokeMMO at least could use some updating from what is currently being used. The sprite style accentuates the body more (hands and feet more separated from the body in the over world, which can really help make the sprites seem more dynamic.) (I still remember when everyone was a color swap of FRLG characters - can you believe the vanity thread was made 10 years ago as of next month? Just wild.) It seems we're at odds on this front, but I believe there's still a good number of people prefer the look of gen 5, with some good reason. I don't doubt there was a level of deliberation, but your artistic skill has definitely grown in the last decade, at which point Unova wasn't available. The style we use was chosen because it's the most visually cohesive among all of the games we currently/will support - this was a deliberate decision.