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It maybe doesn’t look so professional if you read the name of the theme in the code. Instead it looks more professional if it just shows the name of the client /wp_content/themes/clientname
But renaming a theme is not that easy. It can break something, stops theme updates, adds another point of error in the entire system
Is it perhaps only an ego thing to hide the theme name e.g. elementor hello theme?
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There is no need to do this. No-one cares.