The Industry determines what is worthy of inclusion in this Industry Standard. If you want to interoperate with Facebook, you need all the Facebook codes. If yo

The Industry determines what is worthy of inclusion in this Industry Standard. If you want to interoperate with Facebook, you need all the Facebook codes. If you want to interoperate with Line, you need all the Line codes, and Wechat, WhatsApp, Ebay, Alibaba and even Github. You want a Taco code point because the data you are being fed contains Tacos, and you want to know it is a Taco rather than a USER_CODEPOINT+XXXXX. And if you don't care about Tacos, you can ignore it because you know it is a Taco and not something important or corruption. And you can just pass it on down the line to some other process that does care about Tacos.