Attended package installations don't scale further than a handful of systems. Unattended package installations scale to millions of systems.
I've installed packages on many thousands of HP-UX and Linux servers and cluster nodes as part of my day job for many years using homebrew scripts, HP's software distributor, cfengine, and more recently puppet. Normally I only get something like a 0.05% to 0.5% failure rate and that's normally due to either hardware failure or a network issue that's gone away next run. If you can't trust your systems to install a package cleanly your systems are too dirty. You should know what versions of things they are running and you should have the filesystems split so users can't fill system disks.
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