The point is to not have a problem. Repetitive diving and prolonged moisture in the ear canal can lead to swimmers ear. The concern here is that ear plugs may pose an additional risk by retaining moisture in the canal and not allowing evaporation.fair point, hadn't thought of that but I don't really suffer from sinus/ear issues so I don't think it would make much difference for me personally, but ymmv
But I admit, I might accept the risk if I had a noisy neighbor. And a post dive ear beer treatment will help lessen the risk as well.