Each package creates a new generation of your operating system. One of the heaviest pains in using a rolling distro is that one day some core part of your system comes crashing down. You can roll back to previous version on a whim.

Each user has it’s own manager, so you can have multiple versions of a same library. It is not containerized software (docker), so you do get those native speeds. Biggest problem is the disk space use, since unless no one uses a package, you can’t garbage collect it.

Other beauty is since the installation is based on a config file it’s trivial to have the full setup on multiple devices. (Much easier than hand rolled installation shell script)