I have not seen the beta of these new Inbox features, but wanted to reply to your info. In our district, the Send to individuals box is UNchecked by default. This would not be a change for us. Maybe this is specific to certain builds or admin options?
Secondly, from what I've gathered in my experience, when sending sending to all students, it does not appear to be a group email to them. It simply keeps them in the same Inbox thread for me vs separate email threads if I selected send to individuals. It's not like a traditional email Reply All function or anything. I've never had a problem where I sent to all and they could see each other's messages. Is this functionality changed in the Beta or is this again something different per admin rules set up?
Just wanted to add my observations and curious about what the community sees versus what I and my district sees.