And they will keep information asymmetrical in their favor. No. Matter. What. In the long run they will be dishonest with you, they will lie to your face, and they will keep you in the dark. You won't know plans until they want you to know plans. They have to. It's the only way it works.
You, as the employee, need to play the same game in the same way. Defensively. Know that you can keep information from them. Know you should only give information that is beneficial to you. Never self- sabotage. Never be weak. Business is a ruthless competitive game, and that includes employee to manager. You have no obligation to be honest in an exit interview. If it sucked horribly, leave with a smile and say it was great. Make it so they'll give you a great recommendation for your next gig. Lie to them like they lie to you. Bluff. Play chess, play poker.
You don't have to care one whit about leaving your teammates with more work. Does the company give one shit about laying you off a week before Christmas with zero notice? No. They don't give a care at all about the disarray this causes for your life. Ultimately you are a cog, and disposable. You are not "the most valuable resource". You must be as ruthless with them as they are with you. It's the only way it works.
Sure, this sounds super cyncial, you can absolutely do this and not be a dick. You don't have to be a dick at all, just think strategically, and know that you are the only one looking out for you, and you don't owe anyone anything.