Huge amount of turnover ends up leaving large gaps in knowledge, which are then filled in by numerous silos because the replacements don't have the knowledge of how everything fits together. A constant problem is the competing systems and priorities to the point where nothing ever gets done because all of the time is spent actually prioritizing and re-prioritizing when things inevitably fall off the divinely inspired "Roadmap". (which has yielded exactly how much incremental revenue over the past 3-4 years?)
The people who have made the decisions that have caused the company to lose market share and revenue are still responsible for making those same decisions, which is why the stock price has crashed while competitors are soaring.
Compensation is pathetic and it is not hard to see where the money that could be allocated to merit increases and bonuses is being wasted on, ahem $80K xmas party, a couple of $50K all hands, not to mention the Senior Leadership Team (SLT) being treated like royalty and having catered lunch every day while the actual worker bees who get the job done hope to afford something decent from the food court downstairs on the pittance that they are paid. Seeing the money just pissed down the drain on the SLT jetting around the world makes it all that much harder to see the bonus pool shrink and shrink each year.
People are not just cogs that can be replaced and that fact has proven itself over and over as good talent leaves and the company continues on its slow march to irrelevance or being bought out.