>>534743010
It has an aoe range, and affects all allies. So you can have breakfast with everyone around you. If someone is outside the aoe, you can add that person to the party and walk them over, or just cast the feast a second time near them.

Tossing aid and hero's feast on your party before they leave camp is pretty reasonable and realistic, and the only thing youu're really saving is the spell slot if you use a camp casting drone from withers.
The thing that is sort of pushing it imo is warding bond, because that spell is supposed to be balanced around the fact that you take half the damage, and leaving the caster in camp actually circumvents a developer-intended balancing factor. But stuff like aid, hero's feast, longstrider, the only thing you're saving is the spell slot, so it's just a time saving thing.