Right off the bat i read

One standout statistic was that projects with clear requirements documented before development started were 97 percent more likely to succeed. In comparison, one of the four pillars of the Agile Manifesto is "Working Software over Comprehensive Documentation."

You need clearly defined requirements to write a good user story. Documentation comes after.

However, while the Agile Manifesto might have its problems, those stem more from its implementation rather than the principles themselves. "We don't need a test team because we're Agile" is a cost-saving abdication of responsibility.

Precisely, once once have i worked in a company where agile was properly implemented and, yes, user stories were well documented and discussed before being developed. All others are just waterfall in disguise, or Fragile™.

However, while the Agile Manifesto might have its problems, those stem more from its implementation rather than the principles themselves. "We don't need a test team because we're Agile" is a cost-saving abdication of responsibility.