I don’t think it’s just a feeling of futility - it’s true phones can be distracting and offer more potential entertainment, and it’s true learning can sometimes be a slog. At the same time, learning can be fun and engaging, and phones can offer access to a wealth of information (of highly varying quality, admittedly).
Concentrating too hard on mere academic success as gauged by metrics like school grades is undoubtedly discouraging for a student who only goes to school if they are told they must.