Yes cultural fitness reasons. Everything off the top of my head (drawing from experience) are exactly that. Two quick examples: Conflicts of character between them and their uppers along the report line. Being tossed aside for failure due to reasons out of their control.
But the staff member is still damn good at something, and is in need of a different venue to shine.
This shedding activity is referred to as the child's playing-card game "baba-nuki" (Old Maid). You are drawing a card from the other company's hand but don't know what card it is because they aren't showing you the face side. There is an emotional element to it (as with nearly everything else here) but also, maybe most importantly, Japanese society is quite fluid this way, it's one of the country's strengths. Everybody can understand if it is explained to them.
But the staff member is still damn good at something, and is in need of a different venue to shine.
This shedding activity is referred to as the child's playing-card game "baba-nuki" (Old Maid). You are drawing a card from the other company's hand but don't know what card it is because they aren't showing you the face side. There is an emotional element to it (as with nearly everything else here) but also, maybe most importantly, Japanese society is quite fluid this way, it's one of the country's strengths. Everybody can understand if it is explained to them.