You entirely missed the point. From the original comment, it's likely an IT department, meaning a large org, meaning slow changing policies in place about how

You entirely missed the point. From the original comment, it's likely an IT department, meaning a large org, meaning slow changing policies in place about how the machines are setup, often in order to meet even slower changed compliance laws. Your seven different "vendors" solution to bodge domains/outlook wouldn't be supported by IT, which is a problem when then machine breaks or an audit happens...