My response would be that if you cannot explain your position, then you cannot defend it, and therefore you do not understand it yourself. This implies that you are simply feeling you way into your position using gut instincts, which are easily created and manipulated without a reasonably sound argument. An ad on TV, a op-ed piece only half heard, a slew of biased headlines, and more all contribute to these gut feelings without providing a rational base.
In short, I reject your claim that complicated positions cannot be explained. Yes, many can’t be easily explained, but you should still be able to explain and defend them.
So when the position is challenged and you can’t defend it because you have only these gut feelings at the core, you fall back on the belief that anyone would have the same feelings eventually. This is, of course, not true.
That does come with the unavoidable side effect that the majority of the people will simply not participate. It then follows that sites like Reddit will continue to be the place where the majority of the people will go.
If your goal is to participate in small communities and you are okay with the slow pace of those communities, then that’s fine. If your goal is to move people away from corporate-sponsored media for whatever reason, then this won’t work.