Tekken 7 sold over 2 million... if they don't put SCVI on Xbox, they must have been really disappointed by whatever percentage of total sales the Xbox constituted.
I want to say that the outcry would be somewhat different, since MS has nailed image quality with X1X (automatic supersampling, etc), but of course it's easy to say it's too fledgling and niche. I wouldn't be happy, anyways, since I'd consider the best way to play it would be on the aforementioned system with dat geo-dpad of the Elite controller, or barring that, the latest Hori 6-button. I definitely won't ever be forking out for a PC that can run it. I guess I would eventually fall back on Switch since I hear the dpad issues with the Pro Controller may have been resolved.