Perhaps it’s the make of the bottle the ones I’ve seen (mainly coke zero and iron bru) don’t seem to get in the way, dangle or inconvenience me. The only awkwardness is closing the bottle again, you need to give it a little tug to align it right before closing it. I have to trust that if it even stops 1% of the damage we are doing to the planet then a little awkwardness is acceptable. Because every little helps. I could easily argue they are not doing enough elsewhere before inconveniencing me, but at the same time we all should be doing everything we can to turn back the damage we are doing to the planet, we all live here afterall. Unfortunately not everyone thinks that way so we need to attach bottle tops and drink through paper straws.
I have used them, mainly FPS games. I also have built in functionality to change my mouse sensitivity in my mouse. There’s a “sniper mode” button as well that will change the sensitivity whilst the button is pressed to allow me to be more precise (not that I use that as I don’t play many games like that)
I used the separate x and y options when I was using a tracker ball once. It went slower vertical than it did horizontally so being able to change them individually was a huge help.
Other people that might make use of this feature (and perhaps even render a game unplayable without it) is disabled people, I don’t have experience here, but it’s not hard to imagine use cases, poor hand mobility, limited reach etc.