I believe it is a personal choice. I did not enrol my daughter in any of the enrichment classes last year, so I believe it is perfectly fine if you do not want to enrol yours.
For next year, I have enrolled her in the Chinese speech and drama to increase her exposure to Mandarin Chinese. My neighbour enrolled her son In the art class. I must say I was very impressed by the works that the vendor did with him. However, my daughter preferred speech and drama to art.
Yes, the school has a long waiting list. All the best.