Before this, I worked for a company that build almost everything in Java and we had to constantly explain why things were in Java and what we were doing to move things to a more modern solution.
But you don't read blog posts about those companies because they choose not to write them. The blog posts you see about the backend technologies are from companies who are proud to use those technologies and want to promote their use of that technology. The companies who use Java (mostly) are companies who aren't going to write blog posts about their backend technology choices.