Only a fool will knowingly go outside the demonstrated limits of the aircraft, unless your a test pilot doing trials. It demonstrates poor airmanship and confidence that has not been backed up with adiquate experience.
Arguably true, but simplistic.
The test pilot, at the end of that certification programme maybe had a few hundred hours on the aircraft. There will later be pilots who have flown many thousands of hours on type, and developed a far greater familiarity with it than the company TPs, however good they were.
So long as no structural limits are exceeded - which is unlikely unless the crosswind landing was mishandled, there may well be cases where a line pilot will be able to safely go beyond the "max demonstrated".
G