Rather than try to build every feature possible, ConvertKit focuses on being the best at email marketing and then building great integrations with e-commerce, landing page, and membership site providers.
In this onboarding process, ConvertKit is showing and teaching you how to set up your ConvertKit account, according to your own wishes and activities. In this email sequence they use learning videos, because this is a good way to inform interested parties. Also they have strategy suggestions for you and your business. At the end of this e-mailsequence they want you to create an account and pay for their services.
More information about ConvertKit: https://convertkit.com