The frontend complexity one rings very true. I know they are largely talking about CSS changes in the article, but I think sometimes experienced developers can just discount the frontend as a whole.

At my job my coworker and I did a major refactor on part of our frontend codebase. Probably 2,000 lines of code were changed and the only comment on the PR was for additional unit tests on one method we had touched on the backend. We brought it up multiple times in standup that this really needed to be reviewed properly and we got radio silence. The PR was just passed through.

Your entire platform really does matter, it's important to make sure all things work. Not just what you understand.