Kinda. On AoS and GHB 2017, mixed Order was very viable and fun. It was reasonably competitive and allowed some interesting builds.
AoS 2.0 changed a lot the filosophy of the game, giving armies traits, prayers, artifacts and spells, making "pure armies" much more powerfull. Also 2.0 introduced the 1 in 4 allies rules that further even down the viability of armies like Phoenix Temple, Order Draconis and so on.
So we were invested on an army that was sold as a starter, we collected, we painted and got stuck on the "now what?".
Aelves are into a really unique weired spot right now and i wish we could have at least some kind of fix to allow us to play. The fragmented nature, weired battlelines makes things really complex.