Also a helpful tip that we learned at our company. Sometimes, we log in additional information when a user gets to our site to understand things like load times

Also a helpful tip that we learned at our company. Sometimes, we log in additional information when a user gets to our site to understand things like load times or to log JS exceptions and such. If you are firing any background events, those will basically make every visit a "non-bounce" unless you mark those background events as a "non-interaction" event (boolean: true) to tell Google to ignore it for bounce rate calculations.