Why would you feel calm and comfortable from a sunset? Probably to get you sleepy so you go find a place to sleep since there isn't much useful to do at night. That would be unrelated to play.
Anyway, most of our feelings comes from nature, we didn't evolve to be faulty, we evolved to do things efficiently, play is a part of efficiency. If it isn't for learning you would have to explain what it is more likely to be for. When kittens play and chase things or play fight with each other, do you think they are just wasting energy for no reason? No, they sharpen their senses and learn to hunt and fight.
As an adult, I find it fun and enjoyable to seek out sunsets I find the colors beautiful. I readily hike mountains just to enjoy a sunset. I watch a sunset and then go party till 3 am, so maybe it's got to do with finding a nice place to sleep, or maybe it's just nice that we have the ability to appreciate phenomenon without having to apply some rigorous concept to it. I'd fly 2/3 of the way around the world to watch a total eclipse.
Personally I think you might be clasping at straws trying to equate every pleasant experience to some type of reward function.
I'd go as far as saying if we worked this simply and predictably, then our lives would be much easier. We'd all be exercising for that dopamine hit, we'd all be going to bed early after a nice sunset, but we dont.
> Personally I think you might be clasping at straws trying to equate every pleasant experience to some type of reward function.
No, here I just focus on why play is fun, you tried to pivot to other pleasurable experiences. Unlike watching sunsets basically every animal plays around as kids, that play is therefore something that is directly related to survival of the fittest or we wouldn't see that everywhere. You need a really strong argument why for humans play doesn't fill that role when it fills that role for basically every other intelligent animal.
> I'd go as far as saying if we worked this simply and predictably, then our lives would be much easier
So you think humanity would be better off if nobody played around and discovered new things? We would be stuck as monkeys in trees then. Play is pivotal to humanity.
