In general, being happy is probably not something you talk about too much - it's the "normal" state of being and talking too much about it makes you look like you're either bragging or trying to sell your two week seminar. In that regard, it's a bit like money - if you have enough, you don't talk about it much unless you get really lucky (sell company, win lottery etc), but if you're lacking it, it's on your mind all the time.
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.
Definitely agree that it is not really on my mind all the time though. It is like money or oxygen that way, you only really notice when you don't have it. That might explain why we only hear about unhappy people online; the happy people simply don't post about it as much. I'll also add the insight from Epicurus that many people are confused about what brings about happiness: https://www.youtube.com/watch?v=Kg_47J6sy3A.
It's funny that that's the expected state, because if you compute through various permutations of different geographical locations, and points in history, levels of socio-economic status etc you get a very different answer as to what the expected state is. You also realize it can change on a dime. And if you look around, it looks like it's starting to do just that.