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@droversdog Most people are promoting the same TF so they probably know how many sparks are needed for the next upgrade. As for upgrade if you don’t have enough materials for the next upgrade still need to tap on the character to check what materials are needed. Also for daily quests I am always having to craft 1 item in Professor Pigs Lab so even if I do have the green arrow I have to check what materials I need for the next upgrade (which isn’t shown) so I know what materials I can burn to complete the daily quest.
An arrow may tell you if you have enough but if you don’t you still need to check what it is you need. The time you lose to check in cases where you had enough isn’t a lot in the grand scheme of things.