How important is it to stick to the platform guidelines in mobile app design?

1. What is the first most important principle to consider when designing an app?
2. Why design is the most important factor in a mobile app development?

What is the first most important principle to consider when designing an app?

User experience (UX) is perhaps the most important ingredient for any app's success. In many ways, it's the glue that holds an app idea together. Great features, a compelling idea, a novel promise—these will all fall short without proper UX.

Why design is the most important factor in a mobile app development?

A good app design attracts the users

If you can create a mobile app consisting of great visuals, infographics, proper theme colors, it is bound to attract the users' attention at the first go.