With the full card image being available for SOS, is there a reason why characters are important enough to make appearances, but not get a card? | tcgmode

I read through The Legends of Strixhaven article on the Magic website and saw that there were prominent characters that they have art for, and have information on/appeared in the stories, but didnt get a card? Why commission art and write a character into the story that doesnt get used for the a...