When sending an email via troop track, the recipient of the email doesn’t get notified of all the people the email was sent to - as if all emails are being sent BCC.
That is correct, this is how the system is setup, it is functioning as designed. You could suggest this as an Idea and if it gains member support perhaps the TT Dev team will look at how to change this. This would not be just an easy change though, if it were just changed overall then every e-mail a leader sent to the entire Unit then everyone would see everyone else it was sent to, this would be undesirable.
Generally, I agree with this approach, but it would be nice to have the ability to do it as needed/desired per new message (or just the first message that is sent).