Hope that clarifies why I think they would be a worthwhile addition. It is worth noting the X52 rotaries have that center detent.
+1 for detents. The stick looks like a control stick from a fighter airplane, so I'd expect the knobs to be optimized for controlling radar antennas, etc. (one of the hat switches would be used for trimming).
I wonder if Logitech could have designed a sprung rotary that would allow toggling between having or not having a center detent.
I have it too on my G9. It would be a good compromise, though I find the feel of the mouse wheel to be too light without detents. Maybe they could add some screws to control the wheel stifness, too?

Why then use G25 technology for there latest offering, rather than use the newer G27 gearing ? I know it's more expensive, but it's not as if the G940 is cheap.
Didn't the SimHQ review reveal some centering problems of the G27 (don't remember precisely what was causing it, but I think it was connected with the new FFB mechanism)? Maybe the technology is not yet without its quirks.
BTW, I see that the review doesn't mention that problem where the stick wasn't completely pitch centered in the neutral position, so I presume the problem is solved now?