I see nothing that says they "buck many of the base systems". They don't personally pursue kingdoms, gold, glory. There's nothing anywhere that says they ignore the laws of the land. In fact, they get along with other races.My point is that halflings get to buck many of the base systems and assumptionss that D&D uses to justify the existence and prevalence of adventurers and no real explanation is often given at the introduction of the race.
So it forces fans to willfully not think about it or create excuses that the other races of equal or lesser importance do not need.
They don't implement a feudal system, it's basically a gerontocracy according to MToF. As far as adventuring the default is a slightly different motivation, for the most part they do it because of wanderlust, curiosity to protect others. It's not like all PCs have the same motivational assumptions in all campaigns. So?