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Pete Lower17,225 Points
Why find by id then css when you can add parent id in find by css?
Why use driver.findElement(By.id("registrar")).findElement(By.css("input")) when you can driver.findElement(By.css("#registrar input")) ?
Steven Parker218,833 Points
Your approach does seem to be more expedient and compact. What's shown in the video may just be using an opportunity to illustrate method chaining and/or avoiding the possibility of confusing anyone with a descendant selector.