What happened to "never change a running system" is that if the system is barely running at all, you better do change that system.
If I'm the new guy and you tell me how to do things and those things seem bad and there's no explanation for why they need to be that way, I'll also ignore you, coz I know how I want to do things and how things can be done better. Don't tell me to do things X way. Many roads lead to Rome and some are better than others. See my other reply. At my very first job I was also told how things work and how to do things. But things sucked and so I made them better anyhow.
Now, in the other part of the thread you also did mention how they just sent you error logs without reading and thinking about them themselves and such. That definitely is a red flag and the kind of thing that will make me fail someone's probation period. Definitely. But just because someone doesn't think that "the way we've always done things" is a good reason to keep doing something bonkers is where I'm no longer with you. And again, probably just your wording/what you disclose in various parts of these threads but it explains why "we concentrate on certain things only" ;)