The "Made in Canada" laws are ridiculous.
We Canadians live next door to a country whose population is about 8 times as large as ours. It's true that America and Canada mostly speak the same language, share the same British roots, and have significant cultural overlap.
But our Canadian outlook on the world is VERY different. CanCon rules allowed our music, TV, and film industries to grow to the point where they are self-sustaining and reflect OUR history and culture. Prior to those rules, our own culture and popular arts were facing extinction, because it was easier and cheaper for corporate broadcasters to import American content. If we hadn't enacted CanCon, corporate and political forces might already have wiped out our cultural and artistic identity.
If it hadn't been for CanCon, there's a significant chance that I wouldn't have been able to write this; I might have a president instead of a prime minister, and I might be in jail or dead for having protested against ICE. Or, I might be bankrupt or dead because the American healthcare system prioritizes profit over health and - in some cases - even life.
So no, those "Made in Canada" laws aren't ridiculous. Similar laws might well be ridiculous in other countries and at other times. History and geography matter.