I have no problem with a Linux distro doing this. Though I'd consider several to already be doing this - any distro you cannot click to install through a GUI a

I have no problem with a Linux distro doing this. Though I'd consider several to already be doing this - any distro you cannot click to install through a GUI a package archive with I'd call blocking casual users from installing non-official software. Though most distros (I know at least Ubuntu / Suse enable this) let you just click package archives to install them.