Wasn't Google a 'minor twist' on existing search engines? Wasn't Facebook a 'minor twist' on existing social networks? The value difference is huge between poo

Wasn't Google a 'minor twist' on existing search engines? Wasn't Facebook a 'minor twist' on existing social networks? The value difference is huge between poor execution and stellar execution on a solid concept. So just because another company has a mediocre product in a space, is it not worth creating a much better and improved version?