"Giant mess" was maybe an uncharitable phrase to use, but it really is a lot of programs that are always used together because trying to mix and match it with other stuff or even just take pieces out is a massive pain in the rear. Again, I don't actually object to systemd. I use it myself because it's so much better supported. It is not always ideal for everything though, and I'm a little sad about the lack of support for other options.

The idea that Linux users by definition oppose any change is just silly though. We almost all got here by making a big change in how we use computers. Almost any change will be opposed by at least some members of any group. That's just how people are. That's not a special thing about Linux users. Sometimes a change that is overall for the better causes some things to be lost, and saying the people who are unhappy with that "by definition oppose any change" is kinda creepy, if I'm being honest. In particular all of those examples you gave are times people were forced into a change that was not all for the better, especially in the short term, with little notice, and no opportunity to voice their concerns in a more constructive manner. Of course some people complained. It would be weird if they didn't.