If your kids have interest and you can afford why not? Just remember 1 thing, don't let it become a force thinking by your kids instead. Do communicate with them to find out their interest and thinking about it.
My sons are coping fine in school w/o any enrichment. They are having swimming and football which if of their own choices no tuition yet but i would think i need to register for my p5 to prep him for PSLE.
my child recently join speech and drama after school, i think he is having fun and found new friends. an hour and half is not bad at all than playing gadgets at home.