In my experience proprietary software is often far more complex, in fact in another league than most FOSS SW for now (source: have installed and reinstalled so many Oracle databases, Enterprise Manager and APEX installations I have lost count.)
Depends on the software and author. Case in point: sendmail; virtually everything ever made by RedHat (the software is free, but there's no useful documentation if you're not a paying customer… cf. NetworkManager, PulseAudio, GlusterFS … only systemd seems an exception, for now).
Good point! However, I would agree that server/system software that is "best-in-breed" tend to be FOSS. But I'm afraid I have no studies or other hard facts to support my case.
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