Here's the uncomfortable truth: Facebook can change their rules, restrict your reach, or shut down your page at any time. You're building your business on rented land.
Your website is different. It's yours. You control the content, the design, the customer experience, and most importantly โ you control whether it stays online or not.
Don't put all your eggs in Facebook's basket. What happens to your business if they change their algorithm tomorrow and your posts stop showing up?