Implement CI/CD with Revit to end all collaboration issues.
Talking to other Revit users about what version they are on, it was quickly apparent that almost every user has multiple versions installed because Revit's lack of reverse compatibility, and projects themselves become rigidly linked to a specific version to prevent collaboration issues.
I understand the inability of Revit file formats to implement that feature (https://forums.autodesk.com/t5/revit-ideas/save-as-previous-version/idc-p/6954018/highlight/true#M66...) however, both issues could be resolved if Revit instead would implement continuous integration updates. Now that users are forced to buy subscriptions, it seems this would be the natural progression anyway, and with Autodesk's contentious subscription fee structures, I think users would feel that they are getting more of their value.