URL Routing without using controller names

I'm curious why you would want this. What does it improve for you/anyone compared to standard routes? I'm imagining that this would negatively impact performance if the site grows to be large. This sort of reminds me of how WordPress handles permalinks. You end up with a gigantic "rewrite rules". I understand there may be SEO value to URLs crafted a specific way, but I can't see how that would be a problem if you include "product" where the page is a product, or product-category where the page is for a product category.

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