I'm in total agreement with this. I bought the Dark Core specifically because I wanted a mouse made by an American company that has wireless charging. It has been a disappointment. Very limited lighting options are available for the mouse (and the only game it seemed to actually light up for is Far Cry 5). Is that why they call it "Dark" Core?
The charging is OK, but nowhere near the quality of the solution Logitech has. Corsair has also made it clear that there is no future in Qi wireless charging with their products. New wireless mice are available but none have Qi. Considering the ergonomics on the Dark Core are a bit strange, they lost a repeat customer (me) because I would consider upgrading for something more comfortable -- if, and only if Qi charging is available.
The mouse wheel on my Dark Core recently 'died' (it doesn't 'click' anymore and just turns but does not scroll). I'll take advantage of my warranty but when I get my replacement it will go on ebay, along with my strafe rgb. No more Corsair for me. I've gone back to my Logitech keyboard, mouse, and powerplay pad and won't look back.