On Thu, Sep 20, 2018 at 02:30 PM, Jim Higgins wrote:

reply will go plainly visible and editable before the reply is sent.

Why?   If you are part of a typical conversation group on a service such as this one replies can, and should, always go to all current members of the group.

You can't do this via the e-mail interface and shouldn't be able to, either.

Private responses can go to one or more members of your choosing, but replies to a conversation group should always go to all members of the group.  If you want a side group then do that by e-mail.
 
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Brian - Windows 10 Home, 64-Bit, Version 1803, Build 17134 
     Explanations exist; they have existed for all time; there is always a well-known solution to every human problem — neat, plausible, and wrong.

          ~ H.L. Mencken, AKA The Sage of Baltimore