And no these aren't just features geeks would want, even if they are, geeks influence buying decisions of a lot of people. So they're definitely important. Especially at a time when HTC wants to build up a strong brand with their One series. And for all their trumpeting that they would release only flagship devices, they keep releasing phones all the time. And they fail to release their devices with a consistent branding across all american carriers, or at the same time.
HTC Sense adds no features (like e.g. a notification power control widget like samsung's touchwiz has.) It's just too bloated.
Plus it's just be the fact that the mobile industry is incredibly competitive right now. I don't imagine HTC will have any better luck with WP7/8.