Livewire 4 has officially arrived, and it's bringing a major structural shift by making single-file components the new default. This update changes how we organize logic and templates, even introducing emoji prefixes to identify reactive components in your resource folders. If you've spent years mastering the class-and-blade separation of version 3, you'll need to decide whether to embrace the new 'Vault-style' architecture or stick to the classic class-based approach through hidden configuration tweaks.