Well that is where we disagree I guess.
I think it can be 100% transparent. They choose not to make it so, so they should be criticised. I still strongly believe that if communications between referee and VAR are broadcast we will discover two things: one, referees actually know the laws and are surprisingly good at applying them; and two, your average fan and pundit has no in-depth knowledge of the laws and how they should be applied. I really don't see a downside.
As far as consistency is concerned, they need to address issues like, for example, why a shirt-pull in midfield, entirely in keeping with the way a game is played, 6 seconds before a goal is scored is pulled back for a referee review, but a clear example of standing on a standing foot in the penalty area isn't. It may be that hearing the communications will tidy that up, of course. Until then, they aren't doing themselves any favours. And yes, I am aware their is some subjectivity involved. But whose? Who decides if a tug is enough to disallow a goal? The referee apparently (as long as we assume he isn't under pressure just to rubber stamp a referral). Fair enough. But who decides if a "stamp" is sufficient to rule out a penalty? VAR apparently. So who is refereeing the game actually? They really don't do themselves any favours.