The Right Culture Creates a Robust Management System That Delivers Over the Long Term

First, I don't agree with your claim on the only reason for companies to exist, I believe Deming had a better view (considering all the stakeholders).

But I do agree with the general premise: a "culture" isn't an aim.  The reason a culture matters is that it embodies a robust system that delivers the best results over the long term.  The problem of not having a good culture (but doing well today - reducing waste, gaining customers...) is that over and over we see these companies collapse.  The reason a "quality culture" matters is as a strategy to achieve an aim: long term success.

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Related: Creating a Quality Culture - Posts on Creating a Management Culture