This should be easy:
Instead of the builder icon up top reading 0/4 or 0/5, it would be helpful if it gave us a timer when our next builder will be freed up.
From that post you can clearly see your idea is actually ruled out, below I shall highlight it properly for you to understand and see it for yourself.
Graphical Interface Related:
*Separate tab in chat for troop requests
*Revenge list indicate online/shielded or currently attackable without having to click each person’s button
*Ability to hide certain attacks in battle logs
*Show loot/trophies which were available on battle logs in addition to what was earned
*When revenge used – defense log includes original attack results (resources/trophies/%/stars)
*Modify Att/Def Won stat to include losses as well, example: Attacks: 38/12 Defenses: 3/12
*Add comma or space at thousands space in ALL places: Upgrade buttons, spell/troop buttons, shop, etc.
*Add a counter when all builders are busy to indicate when first one will be free
*Allow iOS Device battery indicator icon to be displayed while in-game
*Upgrade menu listing all things upgradable
*Ability to turn on white buffer lines without moving building/decoration
*Add a League Chat area