What's the use of seeing when your serfs are going to eat? Knowing when to build/open inn.
I would say in early game to know when there will be citizens hungry all the time so you can provide enough serfs to fill the inn, open your bakers so they start producing bread...
Later in the game when you're a bit sparse on resources and you want to feed your soldiers, to make sure you won't prevent your butcher, baker to produce food because they can't feed themself.
For towers: You can see that your towers will be empty so you send some troops to prevent the enemy from sneaking in there.
Same in a push-situation, you know your recruit will get hungry so you send some xbow to prevent pushing. (To will agree on this, he once almost lost his baracks because of this
)
So I have to say it might not be the most useful feature but I can imagine alot of situations where this could have prevent a disaster from happening.
The small condition bar you showed would be good enough, it shows all the information we need.
Kick fast, think Bo.