Pacman + yay is superior. pacman for most packages, and yay to use the AUR, where you can get pretty much anything that can be downloaded online, but as a package so that you can more easily manage what shit you've downloaded before but no longer need.
Until the package adding and removing entropy lits your whole system on fire and you have to untangle dependencies, purge keyring, flush your system and reinstall
Wayland and Xorg are responsible for display, Systemd is an init system, flatpaks and snaps are containerized, cross-distro packaging formats, you know what a distro is, Pipewire and Pulseaudio are responsible for audio, Vim and Emacs are editors, GPL and MIT are open-source code licenses, I can't explain immutability.
Since when is immutability controversial? Linus called out the Google patches as badly designed with massive code quality issues for good reason. Theo described OpenBSDs approach to it and it is truly a simply concept with good security ramifications.