Several studies have shown that assumptions people make about others based on their emoji use are overwhelmingly accurate. Therefore, rather than fundamentally changing human relationships, emojis simply clarify personality 'types' for their audiences.
For example, a 2016 study by researchers at the University of Lancaster found that psychological factors largely determine emoji selection. They also found that there are clear patterns within this. For example, social media users who use 'happy' emojis are more likely to be associated with openness and agreeableness. Importantly, the judgement accuracy of their assumptions was largely correct.