As far as communicating versus not communicating boundaries are concerned, I think that depends upon the reason for sharing.
If you tell someone a boundary in an attempt to control them, or change their behavior, then it's not a boundary, it's manipulation, and potentially a threat or an ultimatum.
If you tell someone a boundary because it will make you feel better about enforcing it, with no expectations regarding any changes in their behavior, then by all means, share away.
When I set up my boundaries, originally I didn't communicate them to XABF, and I discovered that made me uncomfortable enforcing some of them. As a result, I communicated the ones I was having difficulty enforcing, and when they were crossed, I went into action and protected myself without guilt.
I know I did nothing wrong by not communicating them, and I certainly expected he'd probably cross them anyway, but it made me feel better about enforcing certain ones after I told him they were there.