I often spend time counseling patients why two ears (two hearing aids) are better than one. There is a huge advantage to hearing out of both ears and using both sides of your brain to process sound. It is called Binaural Hearing. I like to use the example of seeing with your eyes and driving.
If you close one eye, you can get by, but using both eyes is a whole other world. It is the same for your hearing. You can localize hearing directions better. Your speech understanding is better in both quiet and in noisy environments. To rely on one ear alone is exhausting. We also refer to the old saying, “you don’t use it, you loose it” and those ears that are not treated and not hearing sound and stimulation then we become concerned about nerve deterioration from not being stimulated.