There's also the military approach where there's a clock and you either get promoted or you are out. And then it repeats. Languishing isn't really allowed as an option.
If a job/task only requires entry level skills, why are senior employees doing them?
Not at all. In fact, Netflix didn't even have levels until very recently. When I worked as a management consultant, about half of people left the company every two years at each promotion gate. Netflix's turnover was far, far lower.
If a job/task only requires entry level skills, why are senior employees doing them?