Are enrichment classes reallyy necessary at 2.5 years old?

Hi fellow parents! My son just turned 2.5 years old and I'm already getting bombarded with ads for enrichment classes - everything from Heguru to Shichida, music classes to art sessions. Some of my friends started their kids at 6 months old! I'm feeling the pressure but also wondering if it's really necessary at such a young age. Currently we just do lots of reading, puzzles, and outdoor play at home. Parents who have been through this - did you do enrichment classes? At what age? Was it worth the investment? Did you notice any difference compared to children who didn't attend? Also curious about which centers in Singapore you'd recommend (or warn against). Our budget is around $200/month.