The reasons why playing Rubik’s Cube is not recommended are as follows: a waste of time and energy, impact on life and study, bad eyesight, complex structure, and potential safety hazards.

1. Waste of time and energy: Playing Rubik's Cube requires a lot of time and energy, which may be a waste of time and energy for people who study and work. Completing a difficult solution may require multiple repetitions, which may cause stress and frustration for some players.

2. Impact on life and study: The Rubik's Cube game may make people addicted to it, spending too much time on the game and neglecting other important things, such as work, study, making friends, etc. This can have a negative impact on personal development and life.

3. Bad for eyesight: Playing Rubik’s Cube requires your eyes to stare at the same place for a long time. For people who use their eyes for a long time, it may cause vision loss.

4. Complex structure: The Rubik's Cube has a complex structure and many parts. If it is not used correctly, it is likely to cause damage to the Rubik's Cube.

5. Safety hazard: Playing with the Rubik's Cube with your hands for a long time may cause dizziness and poor mental health, and may cause some damage to your hands.