Well, we modders will help with the slider issue to an extent. Probably won't bring the sliders back but at least various body types can be done. You only need one simple mod to allow underwear removal, that isn't even an issue. With what I've been working on, at the end you run around completely naked as it should be.
As for sexy outfits, it is true, their focus isn't there. They want to make a zombie shooter first, a sexy dress up doll simulation is secondary. They kind of lured in s lot of people with the sexy outfits but now that the game has gotten way more attention they expected, I understand why they have to tone it down knowing the laws in China can be really fucking strict on the matter. Nowhere have I seen them say that they plan to remove them entirely.
For the latest voted outfits they are taking longer because they decided to do both two of the most voted ones. Making two outfits takes longer than one.
Also, the last outfit they added was sexy lingerie, parts of which you can see in my screenshot.