Perhaps I could intervene on that one.
That's why we say that the question is a problem of design and not mode. We can come up with numerous examples about various caucus practices that do the same thing in person. This is well-established literature on the power of leader appointments. People don't want to speak out against their party leader in caucus, for example. The norms about party discipline in Canadian politics are much, much stronger in our system than in, say, the United Kingdom or any other examples of parliament.
At the risk of being a bit blunt, what you're describing is a problem, and it's a problem with other parts of the system. I would say that this is what my colleague has described as institutional immaturity. This is a problem with design, but it is not a problem of the mode with which Parliament chooses to do its work.