It works well when you want to install software that is not compatible with your distro, but it is not a great security measure since it integrates with your host system instead of acting as a sandbox.

Isolation and sandboxing are not the main aims of the project, on the contrary it aims to tightly integrate the container with the host. The container will have complete access to your home, pen drive, and so on, so do not expect it to be highly sandboxed like a plain docker/podman container or a Flatpak.