Magento 2 is not just an update of previous Magento version . Magento 2.0 provides a built-in data migration tool and it’s pretty easy to migrate relatively simple M1 sites to M2. However, if M1 site is highly customized, some functionality might require to be completely rebuilt, or sometimes it even requires to be developed from scratch. Magento 2 is a completely new platform that has been developed using totally different technology that offers advanced features and modern backend UX. Some clients doubt whether they need to migrate from M1 to M2 and they might have sense. No doubt that M1 will be out of date one day, therefore, if the client is looking to promote and develop his e-commerce solution, then why wait?