To be clear, I do agree that a lot of cases of addiction will start with emotional problems getting people into prolonged consumption. However, emotional problems can also get people into obsessive running, yoga or whatever. But after getting their mind straight people generally don't need to be careful and abstain from running due to risk of a relapse of obsessive running --- contrast this with drugs, most prominently alcohol. Risk of relapse only happens with drugs, because it seems to my layman mind that it's not the emotional problems that get people addicted, but substance abuse. Emotional problems get people into substance abuse, but it's the substance that creates addiction, not the emotional problems, because see example with running.
And there are other triggers that get people into irresponsible consumption (societal expectations, such as in military[1]) that aren't emotional problems. They nonetheless often end in addiction, because of what the substance is doing to people's brains.
[1]: I'm talking about what I've heard from my father from Soviet era military about nicotine. I don't know what it looks like now/in other countries.
The vast majority of Vietnam soldiers who used heroin overseas did not continue using heroin after coming home. They weren’t using different kinds of heroin, therefore it is the person and not the material.
Like yeah, a lot of people have OCD-like things going on. It's often fine though! A good psychiatrist will heavily weight "is it causing you problems in your life" before handing out a diagnosis or thinking about treatment.
IMHO what counts as wellness or illness is mostly societally constructed[1]. In various places and times for example, hearing voices or having visions is, if not "normal", accepted as something that can happen to anyone at various times in their life.
A person can be superbly well adapted and functional according to the norms and values of one social context yet be seen as deeply mentally ill in another.
[1] I do agree of course there are problems (often organic) that render people dysfunctional in almost any context. The situation is much more fuzzy for most.