The window for Private Messaging is missing. To me that means PMs are not likely to come back.
Question is why?
Following just my opinion and guessing:
Earlier I asked Agoracom about why it was initially discontinued and the answer was abuse by users and Agoracom is working of making it more secure. I suspect that the abuse was not by us regular users but by nefarious entities who probably had nothing to do with stock investing.
I have read of similar problems with on-line gaming that used messaging for communication between gamers. That feature was abused by 'terrorists' and or 'drug dealers' for anonymous communications.

In essance, I think that is what Agoracom experienced and the problem was too difficult to solve. Authorities may have been involved in dictating how to secure such sites and the costs are likely prohibitive.

Thought I would broach the subject and state my disappointment of how our world is changing.

Adapt or perish, from ever hopefull Ed.