Idle is also treated like a second-class citizen where it should perhaps be a separate game. e.g. Why do I need to play arena games to unlock idle resources?
idle is the moneymaker, classic is the game. The two are interconnected though: playing classic just rewards you in idle (arena, coin leaderboard, coin games etc). That's not saying idle is bad, but Fizzer has made very clear that it was either making money through idle, or making classic pay to win.