Possible downside to 10/20/30/40: does this make employees less mobile? From the company perspective, if we all start imposing this schedule, it might harm the

Possible downside to 10/20/30/40: does this make employees less mobile? From the company perspective, if we all start imposing this schedule, it might harm the recruiting pipeline. While startups all want committed employees, to what degree are they depending on the fact that, in the case of success, they can poach heavily from employees that have 1-2 years of tenure at their existing jobs? Side effects are always important to consider. The "law of unintended consequences" is powerful.