Excellent point IMO! For an organization to believe itself the sole proprietor of relevant and useful knowledge within it's domain of operation is pure hubris.
So too is believing it is anything more than a community of individuals, cooperating on the basis of shared- and tacit knowledge as well as skill to perform the different tasks that comprise business operations. Tacit knowledge and skill resides in the specific individuals, and shared knowledge in the specific relations between individuals. Losing an individual is losing part of aggregate tacit knowledge and skill, as well as all the specific relations shared by the individual. The organization as a thing-in-the-world loses part of itself not captured by it's charter and governing contracts (or share value, or business strategy, i could go on). These things are hard to quantify on the best of days, so to assume (or even mandate) that this cost is incurred with net benefit (by, as you say, hiring some industry heavy-hitter who is expected to bring the goods) is fraught with unknowns, and on balance likely hubris.
So too is believing it is anything more than a community of individuals, cooperating on the basis of shared- and tacit knowledge as well as skill to perform the different tasks that comprise business operations. Tacit knowledge and skill resides in the specific individuals, and shared knowledge in the specific relations between individuals. Losing an individual is losing part of aggregate tacit knowledge and skill, as well as all the specific relations shared by the individual. The organization as a thing-in-the-world loses part of itself not captured by it's charter and governing contracts (or share value, or business strategy, i could go on). These things are hard to quantify on the best of days, so to assume (or even mandate) that this cost is incurred with net benefit (by, as you say, hiring some industry heavy-hitter who is expected to bring the goods) is fraught with unknowns, and on balance likely hubris.