As an example, I had a headless devuan instance that took an extra ~50s to ssh to today, repeatably. Checked to see if it was DNS -- wasn't DNS. Checked to see if it was misconfigured ssh -- wasn't misconfigured ssh. Eventually it turned out to be that /etc/pam.md/common-session was misconfigured by installation default to have 'pam_elogind.so' set up, which was trying to do some cockamamie dbus bullshit to communicate with some linux desktop nonsense that wasn't even installed, and there were a bunch of extremely poorly configured timeouts (!) (!!!) which eventually caused ssh to hang.

Each of these components was obviously written by some deeply incompetent junior developer at IBM working on a jira ticket as part of the continuing effort to slather enough janky nonsense on top of linux that it might maybe behave one day enough like windows 95 to be usable as a desktop environment by normal people. And then the default was set by some deeply incompetent environment package maintainer and accepted by some deeply incompetent debian committee.

This lumbering corporate enshittification of what at the core used to be a simple and comprehensible system is why things like freebsd and alpine (and, to a certain extent until today, devuan) are a breath of fresh air to use. When the system is not being actively undermined by a bunch of new grads with jira tickets and no understanding of the entirety of the system, it's amazing what you can get done.