Change in comics

Well Batman, Superman, and the Fantastic four have all changed in some way shape or form. May it be the artist that designed them or the very fabric of how the Character has stood for or how they had fought evil and such. Like Captain America and how he has changed with feathers on his uniform now and that is due to a new character designe.  But hes not the only one. Batman also has and well what he stands for in general.  But that change really happened to all comic book heros when they went into that so