If at any point you think it's a good idea to build a user tour in your app, stop and go for a walk. The idea is that a good application is self-explanatory. Until you are at that point, you need to rework your navigation, your hierarchy, empty states, and your copywriting.
You have to assume that the average mobile app user has the intelligence of a lizard. Make it so abundantly obvious how the app works, even if it comes at the sacrifice of power users. After all, you need users before you can have power users.
While a user tour might be symptomatic of a lack of easy-to-use interfaces, it's also a necessity to introduce people to a product they don't yet know.
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