Alts are basically dead. Blizzard has stated a second character should be considered a second character, not an alt. They want people playing characters evenly, or not at all. Why, I don't know.
Probably something to do with the fact people leveled dozens of alts to grind garrisons for gold, and mythic guilds running 2-3 raid lockouts a week using alts to gear mains up 2-3x faster.