Because the society considers such culture good (working at an old-style company is more approved of); established companies have government, business, and family ties that give them enough advantage to get away with some inefficiency; and people who don't believe in these values (i.e. potential founders of companies that would disrupt these values) are by definition so far outside of the mainstream that they may have trouble accessing social resources like capital and advice.

There are endless reasons why societies and economies converge on non-optimal ways of doing things. The market doesn't fix everything.