controversial take
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I cannot imagine not being able to inspect my navel, at the end of a hard day, and have confirmation of what colour of shirt I wore.
The lint collected reminds me of the way of the universe; everything slowly sheds its substance and shuffles imperceptibly towards oblivion.
If you ever find yourself with an outie in the future, just grow some hair around the navel and that will keep the lint in for you to inspect when needed. Simples.