I think that you make a mistake by labeling it as anti-democratic. Think about it this way, I said in this thread that I didn't even want to vote for some subjects because I know that I am totally out of my depth, if you look at Brexit there isn't a single official that understands every aspects of it, not one. But people were asked to have an opinion based on anecdotal or flat out lies, and logically most people were unable to spot it, in fact some officials probably didn't spot some of the most ridiculous claims, one of them was Cameron claiming that he successfully negotiated for a law that was created in 2003.
What I'm trying to say here is that in theory in a representative democracy, parliamentarians are given the tools and time to study subjects that are out of their remits, you and I don't have that time, we can't study CETA article by article and be supported by experts, we are not in an optimal context and our potential vote will definitely be misguided even if we take the correct decision.
That poor context is what fringe politicians want, that's why they are often asking for referendums. They know that we don't know and they know that we won't know unless someone tells us which they can label as scaremongering or conspiracy.