The advantage is that the monitor provides the sort of usage data the company can sell to others. To be clear, it's not an advantage to you.
Due to this, I have my own specifications (not fully written, although I did write a lot of it), which are much simpler than HDMI. (It has digital video (with no inherent picture size limit, although implementations would be limited), analog audio, and an optional IMIDI (which is a two way command stream; it is safe to avoid connecting it). The IMIDI can be used for captions as well as for control, and can also be used with IR, as well as with the special IMIDI port.) (These would be fully free, although there may be trademark licenses (perhaps to avoid many of the problems that HDMI and others have) but no other restrictions.)