To my surprise, Bill C4 made it through parliament in record time. Personally, I think this is a good thing. However, I also know that Social Conservatives and Gender Critical factions will ally with each other to challenge the legislation in the courts.
I suspect there was an agreement drawn up in the CPC caucus to allow the bill through with a minimal amount of fuss because they have finally figured out that pushing attitudes that go back to the 1950s probably isn't going over well with Canadian voters. In a minority parliament, the last thing a party that has lost 3 elections in succession wants is to be tainted again with various members engaging in bozo eruption moments over a hobby horse issue.
However, let's put political strategy aside and take a look at the likely avenues of attack that will be used in the courts to argue that Bill C-4 is either too broad, or overly intrusive into the lives of Canadians.