You are right. It doesn't make for interesting storytelling, that why I've been trying to push for some latitude. But I've been told, unequivocally, that the draw of halflings is that they are never the important people, that they are always overlooked.
And you didn't present an individual, you presented a family. A group of people who are important, supported by the Kingdom and known throughout the region. Exactly the types of things I've been told halflings never do. Exactly the sort of things I WANT halflings to be able to do.
Then I'd say you missed quite a few posts. Because it has come up. They are content with what they have, to the point of never looking beyond their Shires. There is almost no way to thrust greatness upon them, because they are so disconnected from the world that they might as well not exist. You say they are everywhere... but whereever they are they aren't important, they are painted over.
Well, if you don't think that halflings mooch of humans for protection, you haven't read the PHB. "Humans are a lot like us, really. At least some of them are. Step out of the castles and keeps, go talk to the farmers and herders and you’ll find good, solid folk. Not that there’s anything wrong with the barons and soldiers — you have to admire their conviction. And by protecting their own lands, they protect us as well.”
And guess what, even that entry states that if you are looking beyond the castles, lords and soldiers, you find farmers, herders, shopkeepers, craftspeople, traders, tinkers, and good solid folk. Just like with every single other race.
Do you think that there are no elven or dwarven shopkeepers? No Dragonborn Traders? This is what I don't get, every single race has commoners, common people with no aspirations for greatness who may have greatness thrust upon them.... so why am I constantly being told that the only way to truly express that story is through halflings?
I played a Tielfling Storm Sorcerer who all he wanted in life was to live a quite life as a jeweler, who was literally forced by the Gods to go on an adventure (friend of mine's first ever campaign).