These are some situations when WordPress is not recommended:

If the client is working on the non-CMS based project.
For sophisticated and innovative e-commerce sites.
Sites which require custom scripting solutions.

WordPress is an incredibly versatile platform that powers a significant portion of the web, but there are certain scenarios where it might not be the most suitable choice for building a website. Here are some cases where WordPress might not be the best fit:

Highly Customized Functionality: If the website requires highly customized functionality that cannot be easily achieved with WordPress plugins or themes, then a more custom-built solution might be necessary. While WordPress is flexible, extensive customization may require significant development effort, potentially making other platforms or custom development more appropriate.
Performance-Intensive Applications: For websites that require extremely high performance and scalability, such as complex web applications or large e-commerce platforms with millions of products, WordPress might not be the ideal choice out of the box. While performance optimizations are possible, other platforms or custom-built solutions may offer better performance for such demanding applications.
Strict Security and Compliance Requirements: While WordPress itself is secure and actively maintained, the security of a WordPress site also depends on the quality of themes, plugins, and hosting environment. In cases where strict security and compliance requirements are essential, such as handling sensitive financial or healthcare data, a more specialized platform or custom solution might be preferable to ensure compliance with specific regulations.
Static Websites or Single-Page Applications (SPAs): If the website’s content is primarily static or it functions as a single-page application, using WordPress might introduce unnecessary complexity. In such cases, static site generators or frameworks tailored for building SPAs may offer better performance and simpler development workflows.
Minimal Content Management Requirements: If the website’s primary function is not content-centric and requires minimal content management capabilities, using WordPress might be overkill. In such cases, lightweight frameworks or platforms specialized for the website’s specific functionality may be more appropriate.
Complex Data Relationships or Workflows: WordPress excels at managing content but might not be the best choice for websites with complex data relationships or workflows that extend beyond typical content management tasks. Custom databases or specialized platforms may be more suitable for managing such complex data structures efficiently.

It’s essential to evaluate the specific requirements, goals, and constraints of each project carefully to determine whether WordPress is the best fit or if another solution would better meet the website’s needs.