Very pretty! However, it is extremely dehydrated.
I think the reason it never grows bigger or produces pups is that it is being grown too hard (and this particular species is not one that offsets prolifically). Plants that are grown hard will often still produce flowers, but tend to not grow very much nor have resources available to make offsets.
Here is one of mine that is probably the same species of Gymno:
It is also dehydrated, but nowhere near as badly as yours. Most of that dehydration was due to a couple of months of neglect (and no watering at all) in late spring - early summer because we had just moved to a new house and I while I moved my collection I lacked the time to take care of them like I should (I am still sorting through the victims of that). However this picture is just after I repotted this plant and it is now looking really nice and plumb, despite still showing its beautiful coloring (I will try and gate a picture tomorrow).
I do not know your watering regime, but in summer (assuming you keep it outside) when it is warm to hot and the plant sees a lot of sun, it needs to be watered pretty regularly. If you are doing that and the plant still looks like that I would see about checking out its roots.
Since the title suggests appreciation of Gymnocalyciums in general here are some others that I grow:
In the first picture below the gymnos are in the back. The one on the left is the same plant as in the first picture above, while the one next to it, is my crazy off setter that has never ever flowered:
