Objections are concerns in response to a proposal. There are several ways of dealing with objection, like amendments, shortening the time frame, measuring the effect, getting more information (for instance from a differnt circle within the organization).
An objection means “carrying our this proposal would interfer with my being able to do my work”. Assuming that everyone wants to do their work most effectively, objections are valuable input. For that reason, we want to find a way of incorporating that information in the proposal, or at least try to get into a better position by finding a safe enough ground to experiment so we can gather more data.