There's no theories or philosophies that make baldness a positive.
Actually there is a rather solid one, anecdotally I think many would agree.
When you start showing signs of aging, it instinctively forces one to consider their own mortality. This can give certain advantages, where risk taking, or worst yet pissing away time may disadvantageous. Obviously there is a advantage loss with a shortened peak appearance however there is also a significant gain if one is able to embrace such situation.
Evolution always gravitates to diverse strategies for many possible scenarios.