Reading through the replies it seems there are bits and pieces of every reply that identifies underlying issues, all of which are right to various degrees.
Canada could have had a stronger roster, some omissions were questionable at best. But ultimately there is still plenty enough skill on the players who participated they could have had success. I haven't dissected the rosters but I imagine if you looked at average draft position or something along those lines Canada is top 3, if not higher? The skill was still there, so blaming it completely on roster/omissions is disrespectful to the other participants. It's not the 1990s or 80s or whenever, for the most part anyone can beat anyone nowadays. While it might be an upset for a Latvia (for example) to beat Canada, it shouldn't be the jaw dropper that it used to be. These things happen, especially in one game elimination events. As Canadians we can't say "if Canada entered a B team it would still be a threat to medal" in one hand then also whine about not winning because the team we did enter wasn't good enough on the other.
Which then leads to coaching decisions. It's definitely curious about the practices, or the lines, etc. In sports we are quick to throw people under the bus, especially coaches being the easy scapegoats they are. I imagine most were happy with the job Cameron did in 2022? It's not like he forgot how to coach hockey.
Lastly, the players themselves underperformed. Going back to my earlier point, there was enough skill on the team to win, but they didn't play up to expectations. They're kids, that happens and hopefully they learn from it and become better. Ultimately the fans who are up in arms and calling for everyone's head will get back into the daily grind within a week and not give a crap over what happened in the 2025 WJC...