Re: Let me try...
Primary would be the lockstepping of installed software to the version of the other packages installed, unless you go to great hassle to make it not so.
Not sure, what you mean by that exactly. apt, yum and others have a pretty good dependency logic (especially aptitude). You still can force whatever you want , things can break though this way. No alternative on Windows for that.
...just aren't up to the standards of the big commercial databases.
I know enough about databases to discern that this is bullshit. First, even if that was true in 99% of the cases DB2 (and even more so) Oracle databases in industry are used where even sqlite would easily suffice.
You obviously don't really know what a WSUS server is...
I looked at this guide and imagined how many buttons I would have to press, folders to open, tickmarks to check, uncheck and click to make it do (with all vendors or just a few?) what I could do with one click or command and maybe one edited line in the /etc/apt/sources.list. Interesting to note here, that it only took MS (2011) ... 14 years years to do partially similar to the Debian apt system.