I have no idea why trying to communicate this simple concept to so many people is like...
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RH shooting defencemen like that
do not have high level experience playing their off side. The relative scarcity of RH shooters means that these guys come up through the ranks playing almost exclusively their strong RHD side.
It's exacerbated in a short one and done type tournament with no real time to familiarize, and where one mistake due to unfamiliarity can mean the end of your chances.
A polarizing and sometimes volatile risk/reward player like Subban who already has trouble fitting within rigid systems play just compounds the issue even further. The way Canada wants to play, they're demanding simplicity from their defence. Just break up plays, move the puck up quick and easy to the All Star caliber forwards. They don't need, or even
want a guy freelancing all over the ice like Subban's strong suit.
And when you've already got guys like Doughty, Pietrangelo, Weber, Burns...there's absolutely zero need for more RHD offence or PP ability.
There's no conspiracy here. Subban just isn't one of the 3 best RHD Canada has available. Especially when it comes down to being one of the 3 or 4 best RHD for the type of systems play Canada wants to employ.