Anything proprietary can't simply be copied over and mirrored for copyright reasons.
https://www.google.com/linuxrepositories/
OTOH, you're basically giving Google root access to your machine.
For example for MTP: https://wiki.archlinux.org/index.php/Media_Transfer_Protocol The one that worked most stable for me was simple-mtpfs, but it's AUR.
It happens with other archwiki topics too, I encounter it regularly though can't think of good examples from the top of my head currently. E.g. the btrfs article mentions several AUR utilities though admittedly nothing important I need right now :)
And then some important development tools, like closure-compiler https://aur.archlinux.org/packages/closure-compiler/
Not maintained (last commit in 2016). So that will be something low on the priority list.
>btrfs
The dedupe tool looks interesting. Noted on my todo.
>closure-compiler
Was dropped from the repository. Probably because of the lack of an maintainer.
I see! Time for me to start looking for a new method of transfering files from android then, thanks for the heads up
I personally just install termux, which allows you to install openssh. Run sshd and then you can use rsync or scp or sshfs or other from the host PC.
Honestly, MTP is terrible on every OS though. Mac and Windows have it a _lot_ worse for interacting with MTP devices.
Honestly AUR has covered everything I've needed.
A case for putting more things in the main Archlinux repositories!