The human ear has not previously been under selection pressure to accommodate extended periods of stoppage. Plugging up or cover ears for significant fractions of the day on a regular basis is out-of-spec use of the human body and may have consequences including infections and skin irritation.
The human ear has also not previously been under selection pressure to accommodate constant noise pollution. Not plugging up or covering the ears (or abandoning civilisation) is also out-of-spec use of the human body and has consequences including stress and damaged hearing.
(Apply evolutionary reasoning consistently!)
On the contrary, whichever wildernesses most shaped our hearing were not silent places. The places people lived, that we know of, in the ice ages were quite wet. Rivers and even streams are constant sources of noise.
There are issues of levels and likely specific frequencies, but complete silence puts the stoppered ear further from the conditions in which it formed as well.
To disclose, I have worked in call centers for a cumulative decade and found that ear infections were more likely if I did not switch which ear was covered at least every week, when ear...
I have often benefited from recommendations for Things I Didn't Know I Wanted.
Given that Less Wrong is a community of unusually intelligent, critical, and self-improvement-focused people, I suspect we can generate a pretty helpful thread of product recommendations — perhaps even a monthly thread of product recommendations.
Rules: