It can end up looking worse,
Here's an old one, where my stubble is dyed grey from sunscreen:
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From a higher-quality camera, around the same time as the top pic:
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From St-Patrick's Day, where I was wearing all of the green items you own, you'll find it if you squint:
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It might look better in the short term but it's a harder look to maintain as hair grows back and I then need a haircut more often. It's also less physically comfortable in the hot, humid summer.