I run most of my software in containers. Firefox is in a flatpak. My terminal shells are all containers using distrobox. My homelab services are all containers. My few VMs (i run a few vituralized rke2 clusters, sometimes a test version of my baremetal harvester cluster, and test versions of my desktops)? Also running in containers. My desktop OSs are also containers (ublue, SteamOS, and SUSE Elemental).

The future is now old man! :p

But honestly linux namespaces and overlay filesystems are the bees knees. Create reusable layers of filesystems, use just the ones needed for a given app/service. Expose just what a service or app needs to for a given function. You end up with an extemly portable, and consistent system that has cleaner seperations of concerns. For basically free. From an app dev perspective you remove a whole matrix of supported configurations to worry about (distro/version/packages installed/etc).