In the blog post by Gleb Bahmutov, the author discusses the limitations of using code coverage as a metric for testing applications, particularly in the context of end-to-end tests with Cypress. The author argues that while code coverage can indicate which lines of code have been executed, it often fails to reflect whether the application has been thoroughly tested, especially for edge cases. Instead, Bahmutov proposes the concept of "element coverage" as a potentially more useful metric, which involves tracking interactions with page elements during tests. This approach could highlight untested elements, guiding more comprehensive test development. However, the author acknowledges that element coverage also has limitations, such as failing to differentiate between similar actions on different elements and not capturing multiple state changes on the same element. The blog entry is based on a proof of concept, and the author invites readers to follow future developments on this idea through Cypress's communication channels.