When did the package manager become more important than the operating environment?
Documentation and support information tends to be organized around how each distribution works or fails. (Or just provided for Ubuntu.) Knowing the distribution of software involved is thus important for sending the correct lmgtfy.com links.
From good Linux questions the reader can figure out or be told:
- Which kernel won't load your graphics drivers (Linux, Android, ntoskernel, Darwin, BSD.)
- Userland so you know which switches don't work (BSD, GNU, busybox, something else.)
- Package Manager (yum, zypper, apt, dnf, up2date, app store, etc) so you know which software won't install.
- Filesystem hierarchy violations so you can't find where anything got installed.
The package manager provides a really good hint to everything in that stack. apg-get implies a Debian derivative, most likely Ubuntu. Use dnf? Probably a Fedora desktop user. Got a question that shows zypper commands? openSUSE or really recent SLES. Yum instructions? RHEL or older SLES. URPMI? Mageia Linux. up2date? Really really old RedHat. Brew? You want the Mac OS channel, this is ##linux. Someone handed you a tarball and 50 pages of ./configure, make, make install? Hello, the 20th century called and wants their unpackaged software back.
Knowing which package manager is involved can also be important for supporting users. Those users who a only familiar with very basic support for their specific distribution need to be given instructions exactly for that distribution. Telling someone to do 'sudo apt-get' a bunch of stuff on Fedora will just confuse them. You'll waste time explaining the explanation. Then you'll waste time explaining that after you get a wall of hate about how everything sucks, your instructions suck, your distribution sucks and why can't we have nice things?
More advanced users can translate between Slack, Arch recipes, .rpm local flavors , .deb or Gentoo instructions. They may package stuff for themselves or others. (Whether or not you have to eat a whole bucket of mushrooms to figure out how to make said package is another matter.)
These more advanced users also know that a particular package in some Google-able documentation may have a very different name for each distributions. Those who have been around longer know that some software is not even be available on the distribution with the issue to solve.
So, yes, knowing the package manager lets people know which Linux tribe you hail from and thus which kind of hate mail to send. I mean support to charge you for. After all, all operating systems suck.