I'm not sure to what extent it's possible to have it both ways. I have not experienced it first hand, but my impression is that such long tenures have been und

I'm not sure to what extent it's possible to have it both ways. I have not experienced it first hand, but my impression is that such long tenures have been underpinned by a social expectations on both sides - that employee will remain with the company for a long time, and that company will in turn heavily invest in new employees and treat experienced ones better than would be expected solely from their "market value". But as soon as that expectation starts to lessen on one side (say, on employees side), it might necessarily reduce it on the other.