Filtering by publishing channel
With the Packagist integration, there is no way to clearly distinguish in the TYPO3 Extension Repository (TER) between extensions that have been explicitly loaded into the TER and those that have been determined and imported exclusively via the Packagist API.
The author's publishing behavior is an indicator of the quality of the documentation and the flexibility of the extension. In case of doubt, the user must read/understand more code in order to use the extension in a meaningful way. An effort that not everyone wants to make.
For this reason, we need a new "Publishing Channel" filter in the TER search with the values "Packagist" and "Extension Repository". If one only select "Packagist", then only imported extensions will be displayed. If one selects "Extension Repository", then only those extensions are displayed that have been explicitly published in the TER, as was the case before Packagist integration.