Yeah with how big a player Sinister was in the Keakoan era of X-Men, they should really let him disappear into the background for longer so they can put some fresh focus on other villains

Sure she was the main charter but as the article pointed out the only time you really see horde characters as the main character is when they become a villain, as Sylvanas very much did leading up to and in the early parts of Shadowlands, sure she for a redemption at the end but in the same note was written out of the ongoing story entirely.