These types of meetings can certainly be described as unethical and unprofessional, but they can also be described as unworkable, unproductive, and ultimately unsuccessful. Although there can occasionally be situations in which business or legal concerns can limit the information provided in a meeting, that is the exception. In fact, one of the true objectives of business meetings is to have thorough and open communication.
When employees are expected to somehow learn about plans, changes, and developments from their co-workers, the good news is that they will indeed gather vast amounts of information; however, the bad news is that most of it will be inaccurate, incomplete, and generally useless.
Since management is not bringing complete information to the employees in these meetings, it is time for the employees to bring complete information to management. You and your associates should advise management of the specific and measurable problems in coordination, performance, and productivity that are being caused by this lack of communication.
If management continues to operate on the theory that half a loaf is better than no loaf at all, it is safe to assume that many aspects of management in this company are half-baked as well.
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