Classic hasnt showed anything. People you speak of are absolute minority. Casual players mostly pick w/e they want and do no swap talents becouse it cost huge amounth of gold and would make them broke. Problem is that people like you (mythic raiders, any mythic+ runners( lot of time force their playstyle on entire playerbase and think that playerbase play exactly how you play. I have bad news for you are one of hell minority. And Bliizzrd first of all wants to keep casual playerbase playing this game. Which means making game fun for casual playerbase. And restricting covenats will make game more fun for casual playerbase and less fun for minaxers. Wonder what audience will be priority.