I think you're right in general that there's usually no point acknowledging good things, there's no lesson to learn or corrective action to take from things being good — that's just the expected state.
What bothers me is I see people constantly talk about happiness like something you chase all your life, some unattainable goal that only an old sage that spent decades meditating would know anything about. Like it's a mythical thing, not the 'normal state of being', as you said.
I'd really like to understand what went wrong that so many people aren't feeling the way you and me would say is normal/neutral. I've started learning psychology just to understand better, but I don't know that there's anything concrete I can do to help anyone. That sort of sucks.