Why would I want to delegate to Cloudflare while still using my host's DNS?

You might want to delegate to Cloudflare for its performance and security features (like CDN and DDoS protection) while keeping your host's DNS for specific records or services they manage. For example, your host might handle email (MX records) or a specific application requiring their DNS infrastructure. Delegating allows you to leverage Cloudflare's global network for web traffic while maintaining control over other critical services.