I think we basically do, the only interesting bit is our perception of phenomenal experiences.
What are other alternative, realistic possible ways to see emotions?
Evolution isn't a god, it has no steering hand, it is accidents that either provide advantage or don't.
LLMs are getting more human-like because that's how we're developing them. Arguably that's about market forces. LM owners see opportunity to exploit people's desire for emotional interactions (ie loneliness) in order to make money.
Only psychopaths think of emotion as nothing but a means to changing behavior. The scary thing is that LLMs by nature would exhibit the same behavior.