You cut out the comparison, which is part of the argument.

When you trying to fully dissect and understand issues it pays off to take the time/effort to go into detail rather than try to be nice and quick because people find it easier when it's short and sweet. If you were trying to appeal to an uneducated and/or short attention spanned audience your method would be right. Cause you need the point quick enough to fit in while they're listening. But if you're talking with others who do not shy away from longer posts/lectures. Those who know a lot about the topic and are willing to take the long haul of dissecting it (as professionals do/should, look at the whole picture) it's better to go longer/detailed to get a better idea of the topic.

I'm not arguing longer = smarter though, and that's not my argument against spam. But longer does help a better/deeper conversation to happen that is harder to have with shorter posts. Spam's issue is like said in the previous post, they don't care for the argument being put forward and will simply troll or support the person making the argument based on if they like the person or not.

And I don't see any emotional arguments on my end, I'm simply highlighting a fact/flaw that is hugely connected with intelligent conversations ability to happen.
Which is you need to be addressing the argument, not the individual. Otherwise you're just being selective in who can argue/debate and that ultimately leads to confirmation bias, only allowing those opinions that agree with your own.

Also have you considered there's another reason people post in spam more?
A normal post in spam has almost no requirements, it requires little effort, not any thinking for the majority of them and can be as random and silly as you want.
A normal post in OT (If you want it treated seriously) needs some point behind it, some thought out argument, and willingness to deal with counter points.

Also on top of that more people tend to enjoy simple games/fun over debates may it be over knowledge of the topic, time it takes or simply not liking to be at disagreement with others.
Spam's nature both appeals to a bigger amount of people and has a lower entry barrier. That is why you find spam more popular and many OT people there, not because spam is inherently better.
Also if the term "High School mentality" makes you uncomfortable then fine, but it's me taking any sort of insecurity and throwing it at spam. It is basic observation noting how the two work very similar, and has also been something others here have admitted to, but I've seen none of them be accused of projecting insecurities.