This is the primary differentiator.
You can download the installer directly from the official Microsoft portal: Available Installation Types microsoft sql express 2019 download
Mixed Mode authentication is often enabled out of necessity for legacy apps. This is the primary differentiator
Even Express benefits from the "batch mode on rowstore" improvements. microsoft sql express 2019 download
To "deeply" download SQL Server 2019 Express is to acknowledge that you are not just downloading a file. You are provisioning an enterprise-grade engine shackled by artificial governors.