You forgot the 3rd case, the stickers can express more than just words and really shape the overall feeling of the conversation. Its a completely different styl

You forgot the 3rd case, the stickers can express more than just words and really shape the overall feeling of the conversation. Its a completely different style of conversation when talking to American friends over LINE that treat it like Facebook vs talking to a Japanese friend that is adding in stickers in between the text to add an entire different dynamic to the conversation. People use stickers differently which also helps show their different personalities.