Is Subacromial Impingement Even A Thing?

A recent systematic review has come out with the title, "No relationship between the acromiohumeral distance and pain in adults with subacromial pain syndrome: a systematic review and meta-analysis"✅ Often we are taught impingement is due to limited subacromial space.✅ The type of acromion has also been theorized as a contributing factor?🤔 What has science told us in regards to these issues?🤔 Are impingement theories holding up to scientific testing?🤔 Most importantly, what does all this mean...