Perhaps dolphins have a far more eloquent communication system that we have not even begun to grasp at this time, such as how we are now discovering specific whistles for individuals within the pod.
The dolphin system is not complex enough. We know this because their brains are not as complex as ours. If we relied on a system comparable to theirs, we'd be failing to communicate a huge amount of what we are capable of thinking.
A replacement system has to be able to achieve at least the same as the current system to be worth considering.
Remember, if we had our same intelligence and were raised with a different method of communication, such as was used in the past with types of clicking and gutteral noises, then this would be what we would see as the best method of communication because we would understand it.
But these systems aren't sufficient for us. Complex thought can only be transmitted through complex communication.
Breathing, communication, and eating without the danger inherent in the human design of choking.
But it can't just be
any kind of communication; it has to be communication sufficient enough for carrying the complex thoughts of our complex brains.
Love your enemies!