I think there are different definitions of DevOps.

I see a difference between a more definite operations team (SRE) vs an engineering team having responsibility for how their service works in production (DevOps).

DevOps is something that all teams should be doing - there's no point in writing code that spends it's life generating problems for customers or other teams, and having the problems arrive at the owners results in them being properly prioritized.

In smaller orgs, DevOps and SRE might be together, but it should still be a rotation instead of a fulltime role, and everyone should be doing it.

Engineers who don't do devops write code that looks like:

  if (should_never_happen) {
    log.error("[email protected] it happened again");
  }

Where the one who does do devops writes code that avoids the error condition entirely (usually possible), or decides what the code should do in that situation (not log).