In addition to the "scout" and "attack" buttons on enemy clan war bases, there should also be a "reserve" button to let clan mates know that you are preparing an army to attack that base.
Many times I find a base with weak air defense, and make an army to attack it, but by the time my troops are ready another clan mate has already destroyed it. I look for another base, but all the others at my level have well-protected air defense, so I am forced to waste an attack on a low-level base.
With a reserve button, this would not happen.








