What limitations and applications are associated with Herzberg’s motivator-hygiene theory?

"Flexibility has been a competitive advantage for ride-sharing companies like Uber and Lyft. Companies’ flexible work hours have been appealing to many workers who appreciate the flexibility that these jobs provide, either as a full-time job or a way to make supplemental income. According to Herzberg’s motivator-hygiene theory, what effect might Uber and Lyft’s work environment have on employee? Although Herzberg’s ideas have been widely read and his recommendations implemented at numerous companies over the years, there are some very legitimate concerns about Herzberg’s work. Although his findings have been used to explain employee motivation, in fact his studies focused on job satisfaction, a different (though related) concept from motivation. Other criticisms focus on the unreliability of Herzberg’s methodology, the fact that the theory ignores the impact of situational variables, and the assumed relationship between satisfaction and productivity. Nevertheless, the questions raised by Herzberg about the nature of job satisfaction and the effects of intrinsic and extrinsic factors on employee behavior have proved a valuable contribution to the evolution of theories of motivation and job satisfaction."