Warlock participation is low because everyone likes to play either rogue or mage, hence why I called it:
People like you is the cause of wow failing. Play retail or learn how classic works and grind.
Why are you even here ?
Yes the horror, because it’s dumb design being able to teleport around. Among other things traveling time, distance and tedium makes the world feel bigger, while also creating the possibility of organic gameplay loops happening on the way. As opposed to Automation, which, doesn’t create nor fuel anything. I could write you a longer list but I don’t feel like it, and I get the feeling you wouldn’t understand anyway.
Warlock can summon, it’s in his class kit, that’s it.
Go figure. Everyone also likes to only bring those classes to raids. And Warlocks only saving grace is the fact that they can curse (meh), and summon.