Anthologies have a profound structural advantage over series. Namely, the story told can be the most important story (leading to the biggest changes) of the protagonist's life. Regular series, which tend to keep the characters the same, may depict the slow changes of real life more faithfullly. But that tends to be less dramatic.
Maybe, but half-hour anthologies also have vastly smaller shares of their running time to devote to setting scenes/establishing characters. That doesn't leave much room for plot, but if one jumps straight into the plot in media res
, it can be hard to make the characters feel authentic. Also, a focus on a particular theme/tone/mood can stifle creativity as much as encourage it. I'm not discounting the points you do make about anthologies, but I don't think they're wildly comparatively blessed against standard series, either.