I don't think their absence is because they're grinding in and focusing on some new feature, I think it's quite possible that they feel they've grown to the point where they feel that they just don't need to interact with Bitcointalk anymore. If the site is profitable and paying for itself consistently, and if they're seeing user metrics growing even though they haven't been here on Bitcointalk, it could be possible that simply word of mouth is what will drive them from here on out. It's like if they build truly the best mixer in terms of function and features, it should spread on its own without their need to interact here with us. I mean, it feels a bit like a slap in the face if that's the case, but I would get it and understand it if that was the mentality they were taking. The best, most sustainable mixer should stand on its own without the team having to get into fine details and arguments on forums. I personally do not feel like Whirlwind is at that point yet where they can drop the community on Bitcointalk and expect to grow, but maybe they do.