These are seed propagated, so there are bound to be some variations but Hisui is one of those that bear lots of flowers.
In the above photo from this year, I had about 5-7 flowers per spike and this is considered poor performance.
In good years, I had easily 10-12 flowers per spike.
Roughly speaking, all the large Neos like Hisui, Manjushage, Taiga...easily produce over 10 flowers per spike. Plus, the individual flower size is larger than typical of the species as well.
This plant is an original division from elsewhere. There are some well known varieties that are seedlings from Hisui. One particular variety has very dark green flowers but you can never find them for sale. I have tried to self my plant a couple of times but it only produces empty pods. I keep trying, though!