While headless CMSs offer many advantages, they also face some criticisms: complex, not user friendly, high maintence costs, reliance on API's. Here is how Cosmos addresses each of these:
One major concern is the increased complexity and technical expertise required to set up and maintain the system, which can be a barrier for non-technical users.
Cosmos was built to be easy to install, and easy to maintain. Web developers need only general HTML, CSS and JavaScript knowledge to be successful, and non-technical users already have the skills to maintain content if they can use things like MS Word or Google Docs.Administrators with a basic understanding of Microsoft Azure can successfully install and maintain Cosmos.
Decoupled nature of a headless CMS means that content editors may miss the integrated, user-friendly interfaces found in traditional CMSs, making content management less intuitive.
Cosmos comes with a collection of very user friendly content editing tools, and has a user-friendly content tools that are intutive, friendly and familiar to use.
Another criticism is the potential for higher development and maintenance costs, as custom front-end development is often necessary.
Web developers need only general HTML, CSS and JavaScript knowledge to be successful. No requirement for React, Angular, .Net or other development experience is necessary.
Finally, the reliance on APIs for content delivery can introduce performance bottlenecks and security vulnerabilities if not properly managed.
While Cosmos does have a REST API, it does not rely on it. So performance and security issues are avoided.