The main reason you should use clear text is because if it isnt clear to read then lots of people will misunderstand your website. this isn't good for business nor enjoyable nor the customer.
Some other points include
Clear: "Our product helps you manage tasks quickly and easily."
Unclear: "Our product is a revolutionary solution that uses cutting-edge technology to optimise your task management for maximum efficiency and effectiveness."
Click the cards below to learn more about each point!