Friendly Challenges? Why not Friendly Wars?
Supercell seems to be in the mindset of allowing us to freely practice our attacking and base designing skills through the new Friendly Challenges. If we get individual practice attacks, why not whole practice wars?
It doesn't even have to be against another clan. Why not a practice war against computers? Supercell could program the enemy bases, sort of how they do it with the trainers in Clash Royale. The enemy bases would be random base designs like the ones in CoC dev builds. The computer enemies would or would not attack your bases too with generic armies that SC can program for ahead of time.
This could help practice coordination between clan members in wars, and practice usage of clashcaller, skitch, external chat apps, and other types of war coordination.
Friendly Wars would not provide clan XP nor give war loot bonus to anyone.