Contao 5 Modernizes Bundle Development with Native Symfony Integration

Contao 5 abandons proprietary patterns in favor of standard Symfony conventions, enabling developers to build bundles more cleanly and maintainably using contemporary PHP practices like Dependency Injection and PHP Attributes. This architectural overhaul eliminates legacy DCA configurations and global registrations, aligning Contao with industry-standard frameworks and improving code quality. However, the transition requires precise adherence to naming conventions and file structure, making correct initial setup critical for successful bundle deployment.