Honestly, if people are going to play this, I don't really care if it's a duplicate Illustration Rare, Pokémon giving alternative artwork for cards people can be expected to play is a good call, and a playable card not getting an Illustration Rare because a bulk card featuring the same Pokémon has already gotten an IR makes the "give random Pokémon IR's" system feel like it can ruin player's chances of blinging out their decks later.
As for whether people will play this, the pro of playing this over Aegislash is that you don't need to find Rare Candy to set it up and that you can immediately evolve your Dwebble on your first turn going second, and also that you OHKO Cornerstone Mask Ogerpon ex (As previously mentioned. I wouldn't have thought about that myself). The bad news is that you need one more Energy to attack (With no Double Colorless or Double Turbo in the format) and that you don't have an impressive ex you can evolve into when you need to do some heavy hitting near the end of the game.