Usually the purpose is, if there were some things that don't help the business to develop.
As an example...
A migration from Magento to Shopify.
If you feel that the content management system does not have the features and functionality you need to run your business, or it is too expensive for you.
This is mostly a business decision, especially when it comes to a content management system.
Let's say you want to grow your ecommerce website huge but you are on Wix. Migrating it over to WooCommerce would probably be a good business and SEO decision as it has a lot more flexibility.
Answered by Kristina Azarenko