The system is designed like this. The level is falling, we are less and less demanding of the children in terms of writing, reading, and mathematics.
Children do not make the effort because we allow them not to and we do not teach them to have a taste for reading and writing.
Video games, social networks, etc. are all activities that bring them immediate satisfaction and take precedence over more relevant long-term activities such as reading and writing.
From then on, the trend is growing.
You may also think that this is done to make people more and more stupid and distract their attention from important things. The more they play, the less they will think and the less likely they are to see the system in which they are locked up.