I mean isn’t that why vesting cliffs exist? I’d extend them to be for far more money but over far longer if I was the employer, but the job market won’t bare it.
That's actually a really good idea. Reuse an already common tool to reinforce what you want. If you stay here longer than your 4 year cliff we'll refresh you at 1.5x the last schedule. That's about what a company would end up dumping into a person's salary who is tenured anyway.
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.