"Over-communication" is not a thing because things change and there is always a reason to communicate.
What people often get bogged down in is what to communicate and when, for fear of inducing communication fatigue (assuming they have an honest intent to actually communicate).
The key word is communicating.
Jira is a powerful and highly customizable software project management tool. Because of its popularity and long-time presence in the industry, there is a myriad of add-on and integrations to the platform, including Slack and GitHub.
Large companies like Disney, Intel, Google, and so on are often show on a PM tool's list of clients. Take this with a grain of salt. While a department or two (or a dozen) might be using the software, the entire company is likely not using the software. The software is simply another tool to them. Don't equate quality with the size of the company using it.