True, reorgs can be disruptive. Those that remain working with senior management the longest (either direct or indirect) seem to have the best experience. This also often leads to people not using their skills best and to frustration with their roles.
Some important decisions are made with missing information that could have been sought. Some products are invested in and pushed without being tested enough first, too.
We say we're transparent, but, it really depends on who you work with and your relationship with senior leaders. Managers need to learn to have "fierce conversations" with their employees with enough frequency, and they also need to learn how to be effective managers (or they shouldn't manage). Leadership needs to discern much better on that front --- choosing which people should manage people. True, the Peter Principle is rampant, probably because leadership doesn’t know any better. Right now, we seem to select managers based on their sales, communication, and presentation skills, or on their high technical aptitude. Are those the best criteria? Maybe. Or maybe not.