Psychological Dependence and addiction go hand in hand. We all know addiction. If you stop using your substance of choice, you will have withdrawal symptoms. Physical Dependance is when you have negative physical effects from stopping. Psychological Dependence is when you have emotional and motivational problems after stopping substance use.
Whether it's to escape feelings, reality, loneliness or whatever. If you feel you are dependent on it if you feel as if you can't stop thinking about it if you feel that it's causing problems in your life or causing distress.
Many people, including Gabe Deem, Noah Church, and myself, weren't using to "escape feelings, reality, loneliness", and weren't unable to "stop thinking about it", but rather developed ED, low sex drive, profound desensitization and hypofrontality and other problems, and this is the manifestation of addiction brain changes.
That comparison doesn't make any sense. I was talking about things that may cause someone to use porn and become addicted. I did not say they were the only causes. Everything you stated about yourself, Gabe Deem, and Noah Church, are only effects that porn has had on you. They are not the reasons that you use porn. Those are all things that can happen in the midst of porn addiction but they are not causes or reasons for going to porn. I'm sure there are reasons why we've all gone to porn and I'm sure they're all different. Just be aware of the difference when you're talking about reasons for going to porn or effects that porn has had on you.
A) Unlikely to cause addiction-related brain changes because it doesn't keep dopamine perpetually high in the way that surfing videos does
That's not necessarily true for everyone. For example, if someone is overly stressed in life, they may watch multiple full videos for hours. That can cause many of the same symptoms of addiction and addicted behaviors. You are speaking to one way of addiction and it affects. That is not the only way to be addicted.
B) Needing frequently changing content is a sign of of addiction brain changes, namely sensitization and tolerance
That is a sign, but it's not the only sign. You seem to be looking at this through a straw. There is more than one way to be addicted. There is more than one way one's addiction can work. There are many many ways an addiction can occur. People get addictions because whatever the substance, it makes them feel good. Whatever the reason they need to feel good can range from "I just like the feeling" to "everything in life sucks".
Also, I never said one video. ED can happen whether or not you go through a full video. It's repeated use that can cause PIED. It' not necessarily that they switch between videos or the way they were introduced. If I, for example, got off to multiple times a day always to full-length videos for years, that can cause PEID. So it doesn't always matter how they were introduced or the reasons they did it. What matters is whether or not they repeat the use consistently for a long time.