I don't disagree, but calling it a fanservice race is kind of discarding all the good potential in my opinion.
Personally I have always been attached to the idea of matriarchies as extremely fascinating because it's something that's so absent from life here on Earth, yet no one would call that niche appeal fanservice. It's only labeled so if enough people are disgusted/putt-off by it as is the case with Seekers.
Everything you listed in support of labeling it fanservice is not inherently bad, it only becomes so when you place it next to the context that someone might be getting off to it in a way that disgusts you.
Personally I have always been attached to the idea of matriarchies as extremely fascinating because it's something that's so absent from life here on Earth, yet no one would call that niche appeal fanservice. It's only labeled so if enough people are disgusted/putt-off by it as is the case with Seekers.
Everything you listed in support of labeling it fanservice is not inherently bad, it only becomes so when you place it next to the context that someone might be getting off to it in a way that disgusts you.