I don't really care but I have a 512GB drive, a few extra GB of NVidia packages or whatever means nothing. I just enjoy the containerization and not having to give it my root password to install things. I'm not on an immutable distro and not having an app invade my core system (in whatever way the packager felt necessary) feels really good.
I'm watching the immutable space though, once it matures a bit more might try it. openSuse has an elegant and simple take on it with BTRFS snapshots.