Yooooooo I'd definitely check you guys out!
As for the reason why xianxia/wuxia/xuanhuan isn't that much popular here is probably because tapas in general catered to western fantasy audience than their asian counterparts. Like, I don't think people here would've ever heard of xianxia/wuxia if it weren't thanks to MDZS and TGCF popularity.
Also, the nature of Chinese fantasy is tiny bit complex (?) to understand. Especially , if you're not quite familiar with the cultures and customs in Asia/Ancient China in general. There's definitely some learning curve needed before people can appreciate the genre wholeheartedly.