Note: In the years since releasing Lumen, PHP has made a variety of wonderful performance improvements. For this reason, along with the availability of Laravel Octane, we no longer recommend that you begin new projects with Lumen. Instead, we recommend always beginning new projects with Laravel.
Soft deletes should work just as they do in Laravel.
Lumen is a bare-bones framework made up entirely of Laravel components. If Laravel has a component that you need in your Lumen project, you can add it.
The main difference I encountered when working with Lumen is the lack of Blade support, which makes complete sense for a microservice.