Each treatment appears once per Mystery Booster 2 pack, and a ton of high-impact cards in constructed formats have been reprinted with these unique treatments
A booster pack is an important part of deckbuilding
So, if a player had a deck with Pandemonium and Saproling Burst for 21 damage to someones face and the Burst was killed post-combo, I can Aid it back into play (and smash someone for 21, such as perhaps the Pandemoniums owner!)
On the flip side, English sets historically have included some cards that Japan did not initially get (though this is less common)
DUAD-JP003 Gogogo Goblindbergh Warrior/Effect, EARTH, Lv 4, ATK 1400, DEF 0 You can only use the 1st and 2nd effect of this cards name each once per turn
And while these exclusives are cool, they can also be purchased on TCGplayer, making them a little less exclusive for online shoppers