Promoting high employee turnover could actually be a very effective strategy for a company's long term sustainability.
If your company is hostile to people sticking around for decades, then it makes it that much less likely that you end up stuck with an machine that relies heavily on poorly documented tribal knowledge that's likely to start falling apart as your core people start cashing out.
Similarly, it makes it much easier to make the business case for switching to outsourcing and insourcing business models. That makes it much less likely that you have to worry about losing money to people who “work from home”.
If your company is hostile to people sticking around for decades, then it makes it that much less likely that you end up stuck with an machine that relies heavily on poorly documented tribal knowledge that's likely to start falling apart as your core people start cashing out.