If the common appearance of an emoji doesn't match its Unicode description, it can happen that we permanently "lose" certain emojis. For example, I once wondere

If the common appearance of an emoji doesn't match its Unicode description, it can happen that we permanently "lose" certain emojis. For example, I once wondered why there is no "pouting face" emoji. There is one in the Unicode standard, but Apple decided to implement it as "red angry face" (even though there already was an angry face), and everyone followed suit. The end.