Depends on what we are "fulfilling". Just think about an extremely overweight person who cannot stop overeating. Yes, they are fulfilled in terms of food, but (sometimes) they are self-loathing and consider the fact that they cannot stop eating a personal failure, so in that sense they are the farthest from "fulfilled".
Same is true for porn, you might be fulfilled in a sense that you get to orgasm in 10 minutes, but there are other facets of life where regular porn consumption or masturbation might have a negative effect.
> there are other facets of life where regular porn consumption or masturbation might have a negative effect
If there is a pathological addiction, yes, it will have a negative effect on one's life, just like most other addictions. (Addiction to sex, for instance)
But, otherwise, I can't really think of masturbation interfering with life that much. People frequently waste away 10 minutes in all kinds of ways.
1). I don't see why that's not controversial. It doesn't seem self-evident. If a person can fulfill the need by watching porn, then by definition, it is fulfilled. If a person finds it unfulfilling, well, such a person will be motivated to branch out and start doing something else.
2). OP claimed that regardless of whether you watch it all day for a few times a week, porn hinders you down from pursuing females. I'd argue that the latter doesn't.
3). Not forming a family doesn't mean a life spent alone. The only people I know who's determined to not ever get married, has a very active sex life and parties all the time. The idea that one can't be happy without a family is fairly outdated.
4). Addiction is a real thing, but one has to recognize that there is a wide gap between pathologically addicted to porn, and just enjoying watching porn.