This idea was come up because sometime we want to go to war with specific setup (gear with event troop boost, full frost & blizzard spell set, etc.). But since changing gear didn’t change your spell & troop, we must change it again in war screen after changing gear set. And most of the time I and few of us forgot to change the spell & troop.
It would be best if we could set gear to also include set its spell & troop. This would be helpful in the event like conquest (gear set with highest skull & spell to attack), or gold raid (full gold set & supportive spell).