Management does not acknowledge such contributions - which are extremely crucial to the org because of horizontal knowledge movements.
These people end up being laid off, because they're expensive. New hires can't be trained to the same degree anymore because the experienced staff are gone, nobody else to consult. Immediate management not consulted during layoffs, people doing the laying off do it based on the chart not the person's actual capabilities on the ground.
Issues that used to take 5 minute clarifications and same day fixes now take 3 days to identify.
It's eventually breeding the culture of not helping others since it won't be on record, and they'll have a target on their backs.
This year, the usual benefits are gone, and people are expected to forfeit leaves to meet an impossible deadline set by new c suite, irregardless of customer experience. Nobody dares feedback saying it can't be done, because then you'll just be replaced until it can be done, so C suite also won't get the true capabilities of their staff.