Maybe not many have seen these episodes with these guys in them, but at least they existed in a few episodes, have story and characterization and a place in the overarching He-Man mythos already.
In my mind Vikor, Oolar, Wundar, and Gygor are more obscure. I have to imagine more people watched those episodes than worked in the Mattel design department where Gygor was built and ignored for 20 years, or saw the concept sketches of "Vikor", or owned a Turbodactyl. We don't even know for sure what Oolar is, but people "can't wait" to get one. And now they're saying they may release Trollans of their own design.
Now, are there about a hundred characters that we "should" get before these are made? Sure. But then again we're getting Vikor as a subscription figure, so clearly Mattel is not all that worried about getting the "must have" figures out early.
I can tell you I'd rather have these than another one of the "He-Men", especially as a subscription slot.
A mixture of iconic, key figures with weirdo unknown and obscure characters is what this line is all about, and I kinda love that about it.