Bad module compatibility: Drupals module compatibility can help you quickly upgrade your site. But compatibility also means you could be simultaneously running multiple modules which have their own code. The wrong combination of modules could crash your Drupal core.

Why do people still use Drupal?

Drupal is better suited for web applications, as opposed to web sites, that need to do complex things, handle complex logic and integrations, sometimes involving a decoupled user interface while maintaining scalability. You need personalization and a Digital Experience Platform (DXP).