Heyo! A bit late to the party but I figured as someone with Schizoid PD I'd throw my two cents in! I'm not gonna directly quote anyone so as not to call anyone out, but I wanted to address a few things.
(Disclaimer: i can't speak for every schizoid out there, of course)
-In regards to the 4 Ds, the Danger part is more towards the self. A lack of pleasure in doing things can lead to extreme, risky behavior if there is a desire for pleasure. Also, maybe more related to Dysfunction, extended solitude in humans can lead to depressive episodes .3.
-I'm an eccentric person, and being rude to people is more effort than it's worth--so I'm friends with everyone I meet. The relationships are shallow though, and I'm ready to let them burn at any moment if people want more from me than I want to give (emotionally).
Not to say I don't have close friends, it's the one criteria I don't have. I've got about 4 people I actually enjoy and can call close friends. Everyone else is on neutral ground with me.
-"Suffering" is a strong word, but I do experience negative aspects. Being a Schizoid doesn't seem like a problem, but it comes with all these little things that make you realize you probably aren't living your best life.
-i too seek praise and validation, but the way I react to it, you'd think I didn't care
-Also, I'm not emotionless .3. My relationship with emotions is just complex. I get mad, I get sad (though mostly only in reaction to fictional characters), I get incredibly frustrated when I'm not understood. It's not that I don't have emotions, it's just that the physical signs of showing the emotion are flattened. OR (and this happens more in person, than on online) I cannot process what's happened and I express the wrong emotion.
But this is the internet! We only talk through text! I know the emotion I'm trying to express, so i can overcompensate with emojis o3o and explanation points! Keyboard smashes and the like!
-I also don't avoid people (unless they're being clingy). I may be detached from my emotions, but they're still there. Being schizoid is complex, and can't be boiled down to just hating people.
But finally. which seems to be your main concern:
I got a diagnosis because it would benefit me. I now have an excuse to fall back on when I just don't have the energy to act like a normal person. Particularly helpful when dealing with family.
However, I don't get treatment cause it's inconvenient. The only treatment for schizoids is talk therapy and I don't.... like... talking a lot.... especially not about myself. I can also manage to be mid-to-high-functioning, probably because of the 4 close friends I've accepted into my life.