Amazon founder and world’s richest man, Jeff Bezos, told shareholders in his final letter as chief executive that the company needs to “do a better job” for its employees, while signaling a strategic shift in Amazon’s priorities and pushing back against criticism of its work practices. Bezos said in the letter that Amazon is expanding its mission to give more prominence to workplace safety and employee satisfaction. “We have always wanted to be Earth’s Most Customer-Centric Company. We won’t change that. It’s what got us here. But I am committing us to an addition. We are going to be Earth’s Best Employer and Earth’s Safest Place to Work,” Bezos wrote. Bezos also said that Amazon’s recent defeat of an attempt by some workers to form the company’s first union in Alabama did not bring him “comfort.” “Does your chair take comfort in the outcome of the recent union vote in Bessemer? …