Challenges and playlists

There's this odd design decision where I see challenges that require me to capture or defuse MCOMs on Rush, but there are no official playlists that specifically allow me to play Rush. Instead I'm forced to play these combined playlists like Attack & Defend, which involve both Breakthrough and Rush. If there's one suggestion I'd like to make is that every challenge you put in the game, should at least be supported by an official playlist to play just that gamemode.