As they are human and their primary enemies are demons that can be hundreds of years old, they have much less experience than their biggest enemies. It has also been stated that many of them have been killed over the years by the most elite demons whereas none of the top six demons or their leader have been defeated in hundreds of years. However, it is possible to retire from the position without being killed as Tanjiro's teacher was a former Pillar.
Of the current generation of Pillars, all have strange personality quirks and even fight among themselves but the one thing that they all agree on is to respect Oyakata even if their motivations for being Pillars are completely different.
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